I've got the Jet Lag blues

I haven't been able to adjust back to this time zone. I'm dog tired everday between 3-5pm. Today, I slept from 5 -645 pm. I probably shouldn't take naps but I have been having head aches and my body has been sore. Then when it is bed time at say between 10 -12 I can't go to sleep easily. More like I'm just laying there looking at the ceiling. Hopefully this doesn't last much longer. This is only my third day back in the States.