My rabbit is sick? HELLPP?

stasis is likely yes. Keep him warm and get him to the vet asap. Quick acting has an excellent outcome. I have been through dozens of these events and lost only one. Your vet will likely subq fluids and give a shot of reglan (depending on how his belly feels and sounds) and a shot of pain meds. Once home you may be directed to syringe feed and give reglan orally until he is eating on his own. He will be needed to be carefully watched throughout his recovery.