I'm sure it would be hard not to think about what might be and what you went through with the colonoscopy. Are you supposed to keep yourself so medicated?
I know you don't want to heat this, but you really do need to get out of bed and do something. If reading and TV don't engage you enough, then you need to think of something that would. I see you were able to post here at PC. Maybe you can play some games on here and respond to other people's posts as a start.

I hope your report will be good.