Yes, I know it is easier said than done and for the rest of us it's difficult to imagine what you have had to endure but that's what you have to do - stay positive!
You need to keep that mind busy my friend and if you are not up to being physical then concentrate on the mental aspects of that.
You're into biking right, given that you've got a tandem then you don't do this alone so why not plan your next trip starting now. Don't plan for the immediate but perhaps next year. Make it ambitious and plan to take your partner with you. Pick a route - your blessed in the US with too many fine routes to choose from - and do the research. Plan every day, every moment. What gear will you need, what will you take, where will you go and where will you stay. Try to tie it in with some event that is en route - and don't make it easy make it ambitious. Think through the detail. How will you record this event, how will you make it special - and how will you let us all know afterwards
You'll need to research the web, get maps, talk to others etc so that will keep you busy for some time to come. Be positive my friend, we are all thinking of you and know you can do it!