Ok, that helps, you need to get food in there to move gas along and treat gas.
1. Go to drugstore to baby section and get baby gas drops. They all have same ingredient. My bunny was 3.5 pounds and his dosage worked out by vet was 0.3ml x2 a day. It comes with a dropper not really for rabbits. If you have a 1ml syringe feeder, use that. Its a thick solution so shake bottle..
2. Next, lay back on couch with bunnys back on you so he is stretched out. Put palm of your hand on tummy with gentle but firm pressure. Press palm down in circular massage motion until you feel bubble. Gently keep your palm in that motion, imagine working bubble down towards his rectum. Remember he's in pain, as gas and massage begin to work that bubble becomes less and less noticeable. 3. Now get food in him, try something like dry oatmeal. If he wont eat, put bunny pellets and timothy hay in blender until you get as close to powder. Add some water until its consistency of applesauce. Use feeding syringe OR put small glob on his lips and he will lick off. 4. If too much time has passes and your bunny still in pain, may be statis and bunny must go to vet. Stasis can be lethal. Keep me posted.