You might need to clean the scent glands.
Cleaning out scent glands
Rabbits have a scent gland either side of their anus. The scent glandneeds cleaning out as the scent is a liquid that can clog up the gland.Its a yucky stinky job, but it needs to be done. To clean the scentglands out, get a...
I would take him to the vet, it sounds like GIStasis to me. Are his poops becoming real small? Hopefully your vetwill give you some pain meds and motility drugs. If your bunny is notdrinking very much water, you may need to give him sub Q fluids throughhis skin.
I am sorry to here that Bub got frightened. Ourrabbit Judah is afraid of the owls in the trees and responds about thesame way as Bub. You did the right thing by picking him up and lovingon him. Sometimes if you wrap them up in a towel when they are afraid,it calms them down.