If there’s a vet in your area that offers around-the-clock care you could ask your vet to let you transfer Alan there. You may live in a country/state that has laws that prohibits vets from releasing suffering animals to their owners, we do in my country but there can be differencesd epending on where you live.
Gut impaction is a very serious condition and if it doesn’t resolve itself with hydration (both sub Q and via the GI tract or in some cases only via sub q fluids), motility drugs and laxative and pain-killers, the prognosis is very poor. Dana Krempels (huge authority on bunny health) suggests giving the bunny an enema in tough cases. Surgery to open up the intestines and remove the blockage mechanically is, to my knowledge, in most cases not successful.
Appropriate pain relief must be given to the rabbit. Pain is extremely stressful and drains the rabbit’ of its strenght and its will to keep fighting.
This is article on stasis by Dana Krempels, in case you haven’t read it already:
http://www.bio.miami.edu/hare/ileus.html
I also found this article for you: http://vetgrad.com/core_modules/entityshow.php?Entity=10MinuteTopUps&ID=41