It sounds like your bun has tummy trouble. How long has it been since he ate? If he’s not eating anything at all, don’t wait more than 6-8 hours before contacting a vet. Have you seen any poop?

You can give simethicone baby gas drops to help him if he has painful gas that can’t escape. It rather sounds like he does, since he returns to the exact same spot he was in. Stretching out weirdly, pressing the tummy to the floor like he was doing push-ups is also typical of gas. Gas and related tummy trouble is often seen with heavy shedding. It’s none the less serious though.

Baby gas drops can be bought at Walmart etc. It’s not absorbed by the body and can be given on suspicion of gas, according to Medirabbit. You give 0.5-1 ml per hour for 3 hours. It often helps within 30 minutes. There is no hard scientific evidence of this, but many bunowners all over the world swear by it.

If it’s hot and his ears are cold, it’s reasonable to think that he has a low temperature. You can warm him up in your lap, with your body heat. While he’s in your lap you can try a very light tummy massage like this:
http://youtu.be/LbyC6CWbm5M

If he’s shedding you may need to help him with the grooming to make sure that he doesn’t ingest too much fur. I run a flea comb through my bun to get rid of excess fur and then roll a lint roller over him after. If you’re just running the comb through and not tugging violently at his fur, it’s normal that chunks of fur would come out during a molt.