Aaaaw, poor soggy Jed! Virtual hugs. (Not likely to get anything on me through the internet.) Fluids are very helpful, hot ones soothe and help with congestion. And sleep. Alcohol does nothing good for a cold (but can help you feel better if you're so inclined.)

See if friends can show up to help you and play a lot of instrumentals. I'm sorry, Mr. Mucous.

Oh yeah, get a towel for the guitar or maybe a couple of (unused) rubber ear plugs. The foam ones just act like little sponges and will still drip on everything, or worse, blow out when you sneeze and stick to somebody across the room. Feel better, friend.