David, further to my post of earlier today, I would add the following:
1. Make sure your vet is competent with exotics and especially rabbits. Exotics, including rabbits, are usually an option within vet training and not all vets choose that option. As a result some are incredibly ignorant about rabbits.
2. Get the rabbit neutered. Rabbits which hit puberty are like perpetual teenagers - interested only in sex and destroying things. Bucks will hump anything that moves, including your leg, and are very good at spraying urine with deadly accuracy, ie you may well get a faceful. Does can become very aggressive because they are primed to protect their young. Neutering removes the hormones that cause this behaviour and your bunny will be a much happier bunny for it. Also with does, spaying removes the uterus and so prevents uterine cancer. Something like 80% of does will develop uterine cancer by the time they are 3 or 4 years old.
3. Rabbit digestion is very delicate and the digestive tract must not stop working because once it stops it is almost impossible to get it going again and the rabbit will die very quickly. Phase any changes of diet in over a period of one or two weeks. Test every new food with a small piece to start with. Unlimited hay (or grass) and a small portion of pellets should be the basis of your rabbit's diet. In pellets, Science Selective or Excel are probably the best, followed by Wagg. Avoid muesli types or "budget" or "value" makes.
See this list for safe and unsafe foods for rabbits:
http://forums.rabbitrehome.org.uk/showthread.php?t=176719