You might still have something lingering around from when you were sick. Like a virus where the cold/flu in May was just a symptom, not the actual sickness. I have a bit of that going on at the moment. At some point I had a virus and now I have some sort of arthritis. I sympathise with the reduced interest in sex, if I drag myself through a day I call it a success :yuck:

If you're feeling off kilter it might be worth a trip to the docs, even if it is just to determine it's viral (or whatever) and it will go away. At least then you know there's an end in sight, and it'll be okay.