I feel bad for you...you have it much worse than me (for now). Exercise is recommended, but within limits... Don't overdo it. Plaquanil (hydroxychloraquine) has helped me a lot with dryness. issues, but the fatigue is harder to treat. It doesn't sound like COVID at all. Blood work should reassure you about the diagnosis. For me: sjogrens symptoms without you sjogrens antibodies, yet high rheumatoid antibodies: thus MIXED connective tissue disease. I do have some joint issues... not too bad so far. I also get lightheadedness and a lot of fatigue. They don't call it mixed or an overlap disease for nothing. Your ills are real and very difficult. Don't listen to well-meaning friends and relatives who diagnose and advise you, and frankly they don't know their ass from their elbow, especially the ones spreading vaccine and dental filling bullshit. People like that were complicit in the unnecessary deaths of hundreds of thousands from COVID. Stick with a top rheumatologist, try the meds ( I have NO side effects from plaquanil) . Get prescription fluoride toothpaste if you’re dry, and regular (every 3-6 months eye and dental exams to be on top of any side effects and prevent dryness dental decay. Biogenesis products for dry mouth and sustained eye drops help dry eye.