My guess is if your bunny starts to show symptoms get them moving and tempt them with all sorts of things. Ive copied some notes from lots of peoples comments on here....
STASIS
Stops eating and pooing, sits hunched up very lethargic -Very serious needs vet asap!!
Vet should feel for a blockage, if no blockage should give a shot of Metaclopromide to get the gut moving and Metacam painkiller. Both should be administered by injection as it works faster and especially as you dont know what the problem is and whether the gut will absorb an oral dose!
Bunny should then be syringed a recovery food supplement Oxbow or Science Selective. Its quite thick so you can add more warmed boiled water. If bunny still hates it, try adding some baby food ie Hipp apple and pear, apple and banana. Fibreplex is a probiotic prescribed alongside critical care also to be syringed.
It is very important to keep bunny hydrated with warm boiled water (the best) a couple of mls every hour, peppermint tea and a few mls of fresh pineapple juice may alos help.
Offer tasty veg and herbs, basil and dandelion leaves are often a good choice!
Its good to make bunny hop around as this aids stimulation of the gut! You can also rum tummy gently.
Keep bunny warm if he feels cold. If you bring bunny inside to nurse bring in the partner also as the bond may break!
Additional meds: If bunny is not eating over a few days Zantac can be used to stop bunny getting ulcerated stomach when its empty. Zantac for bunnies is a prescription only medicine for rabbits to be prescribed only by the vet and is available in liquid form. This is suggested in FHBs book!
Infacol used for bloat if there is a gas build up in intestines. Infacol is fine to give with the other meds. You can give 2ml first then 1ml every couple of hours along with some gentle tummy rubs.