You can have all of the symptoms for an autoimmune disease, and have negative tests. Later on they may come up positive, but a negative blood test should not be the only criteria. I had symptoms decades before my tests for Sjogren's Syndrome came up positive. By the time I actually had a positive test, I was already in need of punctal plugs for my eyes. So, if you feel something is wrong, keep pursuing the matter until you find an explanation. Just keep in mind that autoimmune diseases are notoriously difficult to diagnose because the symptoms crop up like a game of whack a mole, sometimes disappear, or morph into something else, and blood work can be late in confirming symptoms. I wish you the best.