Sorry to hear about your fall, knees are bad too, have a habit of turning into water on the knee and junk. I hope you are ok. Tiger Balm helps my bruises alot, it's really strong camphor and it seems to help me for some reason. Yes, there is a specific blood test for insulin and docs do not regularly do it, though I don't know why since most of their patients are overweight and have bp problems and family hx of diabetes.
My bp started going up when I had hyperinsulinemia and has come down since I started taking glucophage. When you are "prediabetic" you can be "low blood sugar" or hypoglycemic--which docs usually call normal for some strange reason because it doesn't feel normal--and hyperglycemic or "high blood sugar", which they treat. I am both, depending on what I eat and when.
If you can afford it, you might want to invest in a blood sugar meter, you don't need a prescription and a lot of dieters get them, they aren't bad to have around. After you eat dinner, you do a test and see how the food affected you, and you can test first thing in the morning to see how low you are. You can see how much it jumps around--it should be consistent--mine is consistent 100--because your body should be adjusting.
Anyway, if your insulin is really high it usually means you are hypoglycemic at times and your cells may be immune to insulin, so your pancreas is burning out trying to make the enormous amount of insulin you need to try to process sugar, and sugar in the form of fat accumulates in your liver.
The doc can and should do a glucose tolerance test, which is the only TRUE way to see if you are diabetic, no matter what they say, research will confirm this. You have to fast and they give you this high glucose stuff, really sweet. My sugar shot up to 180 (normal range is 80-120) within an half hour of drinking it and I don't know how high it went. This from Miss Normal blood sugar.
I also think some people, people with AI disease?, are more sensitive to small changes in blood sugar. I feel best at 100, 80 or under and I get shakey and panicky --they kept telling me I had panic disorder. Over 120 and I can feel panicky too, or sleepy and not well. It depends. Anyway, caught early, this is a fixable preventable problem and you don't have to develop diabetes, though it seems a lot of people do anyway. I can tolerate sugar much better now that I don't eat it as much, my bp is always normal now and I don't have to take bp medicine and I've lost some weight and my liver should be getting better. Not a bad tradeoff.
Diabetes is one of those things like thyroid, it causes all kinds of problems that seem unrelated. It's an awful disease and I really learned to have so much sympathy for all the older people who have it because full blown it can really be a drag in so many ways. Its kind of my personal thing to try to get people to get checked for prediabetes, especially if they are overweight, because so many docs just see the blood pressure going up and put you on bp meds with doing a glucose tolerance test, and then if your sugar drops for some reason, your bp drops dangerously low and you can end up in the hospital, so its my soapbox.
I have shortness of breath and it's because I have asthma, also I don't know if you have allergies. Shortness of breath was also the key feature of my liver disease, especially climbing stairs, my old professors were passing me by and I was huffing and puffing, ready to pass out. I still am too short of breath to take a regular stress test, but I have asthma/chronic bronchitis/COPD due to scarring of my bronchial tubes probably from all the pneumonia I had and histamine problems from my liver and AI disease. I think the true origin of asthma is in the liver, if I remember correctly. I should look that up. Oh, if you take a pen with the cap on it and draw a line on your arm and it turns red, that's a sign your histamines are high. they do that to me a lot,theres even a name for that test, its a real test you can do yourself. BTW, antihistamines don't help most stuff usually because they only work on certain histamines.
Seeing the cardiologist is good and you shouldn't be afraid. I had some damage because I have those anticardiolipin antibodies and got some atrophy of one side of my heart but once I went on plaquinil and steroids and it healed up. It can heal up, even if you have some damage. I thought that was great. I was sure my heart was bad, but it was the one good thing! The heart seems to be able to take a lot. So don't worry, just go.
It's probably asthma from the liver stress (histamines). Have they done any pulmonology tests for asthma? Do you use an inhaler?
Sorry so long. I'm hoping it's something simple that maybe a med vacation and dietary change (maybe major though) will fix and I hope you feel better soon. Will pray and send good wishes your way.
"...brain, what is brain?"
--Kara, one of the "givers of pain and delight", aka woman of Sigma Draconis VI, "Spock's Brain" episode 56 season 3 of Star Trek--I'm not a trekkie but this one was funny!