My supervisor has it out for me.

[Dijital]

OK so here's the deal, I called in sick yesterday and now my supervisor has it out for me, I've had the body aches really bad the last 2 days so tomorrow I'm going to see my doctor. My doctor will write me a note excusing me from work for yesterday and possibly this weekend if I'm contagious. How he is trying to nail me is saying that he has proof that I was up until 4am playing FFXI, I was up until 4am, because I couldn't sleep since I'd slept most of the day, with my doctor's note should I have anything to worry about?