it might be better to go to the vet and have him x-rayed. If gas is showing up or food in his stomach you will know what you are dealing with.
In the meantime continue with fluids, pineapple juice, water, pedialyte and also hayand pumpkin
I think it best today that you do go to the vet ..
Idealt with this awhile back and by the time i got to the vet the rabbit was well-hydrated and did not have gas and the vet could see the poops forming in the intestines
soI did feel better but he thought whatI had done had prevented a fullblown case of stasis.