No reason to stress out about things outside your sphere of influence. Look for things you can manage, and work to manage them.

Talk to your manager / hr. Ask about accomodations for your situation (remote work? Different desks? More santizer?). Strive to keep your living quarters sanitized. Don't touch your face. Separate you from your mom as much as possible in your living quarters. If you develop a cough, keep your face covered. As for the wedding, a big event is out of the question for the time being. If it is just a courthouse thing, which I recommend anyway, maybe it will be open, maybe it won't. Go with the flow. Any half-decent relationship can survive that. Build a small surplus of emergency food. Work out with body exercises.

Take things one step at a time. Don't worry about things you can't affect. For those things you can affect, do so, and don't worry.

Take solace that nearly the entire history of mankind has had it worse than you do now.