Hey Jessica, welcome to HealingWell; sorry you are feeling so crummy! You have come to the right place, though. All of us have been through the diagnostic rollercoaster with different results. Some of your symptoms - diarrhea, constipation, bloating, and cramps - are consistent with IBS, but bleeding and inflammation are not. Did they take biopsies during your scopes? Make sure they do next time around; sometimes biopsies are the only way to diagnose IBD, because it can present microscopically (meaning docs cannot simply visualize it with the scope, they have to put it under a microscope to inspect the tissue for abnormalities). Even with scopes, the answers can be elusive. My experience has been pretty frustrating as well, as I had occasional bleeding that could not be explained by hemorrhoids, as well as fevers and significant weight loss; but my scopes were essentially normal. I tried everything - from anti-cholinergic and anti-diarrheal drugs to more "natural" methods like fiber supplements and fish oil and calcium - with inconsistent results. I was diagnosed with post-infectious IBS since I had significant parasitic infections in the past after traveling extensively in developing countries. Have you done much traveling? Because a lot of parasites - which can be really tough to find - cause these symptoms.
For your next appointment, I would make sure your doctor knows about the bleeding you've experienced. Also bring along a diary of your symptoms (how many times a day you're having diarrhea, what time of day you're having abdominal pain/diarrhea, etc.) and also a food diary. These tools can be invaluable in helping a doctor to diagnose you.
In the meantime, feel free to ask more questions or simply vent; that is what we're here for. We know what you're going through!
I'm actually a uni student myself in the UK, i'm 22 and in my final year but i haven't gone away to uni because of my IBS problem - i still live at home. My Ibs came on when i was about 16. I know what you mean about not wanting to talk to friends, because it can be embarrissing - but recently i've let on alot more to my mates about my problem and i think it has helped a bit. You know, i've just explained that i don't like going away or going on holiday too much because of my ibs and that sometimes i feel too rubbish to socialise alltogether. I haven't been too graphic over the minor details tho! - but i think just letting them know you have a problem helps, my friends certainly understand. I think your mates will suprise you and be very supportive, don't be worried about unspilling you problems on them because that's what good friends are for!
I myself suffer from a generally 'upset' stomach, with alot of bloating, some D and occasionally C - a bit of everything really!
Bleeding on its own isn't usually a sign of IBS, but can be a product of an illness like Ulcerative collitis (sp?) or IBD which are sometimes also experienced by IBS sufferers - so it probably is best to get it checked out with another colonscopy (i've had one myself, not fun, but unfortunately neccesary!)
Good luck with the tests and hope they get to the bottom (no pun intended) of your problem - make sure to check out the advice on IBS on this site because a number of people have found very successfull ways to allievating their symptoms.