Hi I'm sorry that you've been having such a hard time with things. I'll try to answer a question for you, like Joy said a positive ANA is one of the 11 symptoms that Rheumy's look at to my a diagnosis. There are 10 other symptoms that they look at too.
Lupus is known as the disease of 1,000 faces. It can look like so many different diseases and that's why it's so hard to diagnosis this disease. Some patients are lucky and get the DX right away and others, like me, it took my Doctors 13 years before they added up all the issues I had and said yep you have lupus and we will treat you now.
As for your question as to whether you'll develop an AI disease or lupus with a positive ANA 1:160 that's hard to say. I can say to honestly that my child who is now almost 22, has had a positive ANA at 1:640 since she was 7 years old. Yes, she has some symptoms of lupus, but still to this day she's not reserved at DX of anything AI or lupus.
Healthy folks can have a positive ANA. There are loads of reasons to have your ANA show up positive. I'd suggest that you keep a journal and write down how your feeling. If you gets sores or rashes take photos of them to show the doctor how they look. It always seems to happen I will have a terrible rash going on and by the time I see the Dr it's gone.
It sounds like you may have something going on but it's not raised it's ugly head all the way. I'd suggested the journal, the photos, and try not to worry to much about the ANA. Stress is part of what makes our lupus flare up and be so bad. A positive ANA is considered 1:80 (which is barely positive by most Rheumy's) then the ANA's double up from there.....1:160, 1:320, 1:640......etc. They look at the ratio and the pattern of the sample. I just wanted to make sure you understood how the ANA was read. If you have any other questions, please feel free to stop by and ask away.
Good luck to you and I sincerely hope you don't get an AI disease of any type or Lupus. Take care and remember try not to stress over things to much it won't help the situation any.
DX- RA, Lupus, Fibro, LGL Leukemia, Obstructive & Central Sleep Apnea, Pulmonary Hypertension, Bells Palsy, Gastroparsis, Blood Clots, Glaucoma, Chronic Pericarditis & Pleurisy, Severe Anemia. Way to many medications to list.