Please try not to worry. Stress is only going to compound your symptoms and make things worse.
My guess is that you do have some sort of autoimmune disease, so you should go ahead and make an appointment with the best rhuemotologist you can find. These are the Drs trained specifically in autoimmune diseases - they are really the best to make a final diagnosis.
It really isn't worthwhile to try & decide which auto-immune disease it might be. Any of them can be casual, any of them can be life-threatening, and most of the time they are somewhere in between. Specific symptoms and how your symptoms react to certain meds will help the rheumy make a diagnosis -- but sometimes we can go years being treated & our symptoms put to rest without any clear diagnosis. These things are *NOT* simply diagnosed by blood or other lab tests as some non-AI Drs would have you believe.
We've all had high numbers, excessive worry before diagnosis, etc. Just take one day at a time, stay away from alarming material - try to get deep restorative sleep, eat well and at regular times, get some light exercise each day. (5 minute walk to the mailbox counts).
Hope that helps some
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & LUPUS RESOURCES
"Life is far too important to be taken seriously." - Oscar Wilde