I hear you. I also had a nasty crash about 3 weeks ago. The first two weeks I felt awful on the bike. It felt like I was working hard, but my cyclometer was telling me that I wasn't. Now I'm starting to feel like my old self on the bike. I think that a big part of it was loss of "form". Being bruised and battered made it very uncomfortable to ride. Another part was difficulty breathing because of tender ribs.