Get dehydrated n dry mouth a lot even if I drink lot of water. Blood work for electrolytes fine. Sjogren (ANA, RA, SSA/B, RA) all -ve. Can 30yrmale get sjogr?

One idea. Mikulicz's is an IgG4 immune disease that mimics Skogren's without the antibodies. It's on the list with meds and many others .
Dry mouth. You still may have Sjogren's. We also look at medications or other agents that might cause dryness. I recommend seeing a rheumatologist and would be happy to do a consult if needed.