I have had quite severe signs and symptoms of sjogren's disease for about 5 years. Blood tests are negative. I also have celiac. What do I have?

Can't tell here C MD. You need a thorough evaluation by your doc. This is not the forum to tell you (specifically )what you have.
See rheumatologist. Recommend you see a rheumatologist for a formal evaluation if you believe you have sjogren's. As for celiac disease, it can be diagnosed by a simple blood test or with biopsy of your small bowel during an upper endoscopy.