GI stasis is a potentially deadly condition in which the digestive system slows down or stops completely. If your rabbit is showing any symptoms of GI stasis, bring him/her to a rabbit-savvy vet. 
 
Causes of GI Stasis
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A high starch, low fiber diet
Stress (environmental)
Pain from underlying issues (like dental problems, urinary tract infections, gas)
Lack of exercise  
 
Signs of GI Stasis
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Refuses to eat or drink
Small and/or malformed fecal pellets
No fecal pellets Lethargy / hunched posture
The bunny will sit in a corner and not want to move 
Grinding his/her teeth due to pain
 
Treating GI Stasis
 
Consult with your veterinary immediately and before treating at home.
Abdominal massage
Infant Gas drops (simethicone), 1-2 cc orally with syringe with no needle, wait for 45 minutes after the first dose if the bunny doesn't start eating and moving administer another dose. Unlimited hay
Have the bunny exercise (run around/play)
Vet may provide pain med and IV fluids Oral fluids  

Signs of recovery
 
Bunny will start moving around
Desire to eat and drink will return
They will come to you for affection
Provide plenty hay  

GI Stasis Prevention
 
Provide lots of hay
Limit starchy treats, fruits and food
Give them Exercise