Hello,
Well this is a somewhat difficult question to answer. Here has been my experience. If you do not have the ability to see a surgeon and have this corrected by them (in my area it would be anywhere from $2000 to $5000. Then I always suggest strict cage rest. No leaving the cage for two weeks. No exceptions. The crate should have a very low bed, low sided litter box and food and water. They should be fed a watered down wet food to keep the stool soft and easy to pass. After two weeks see your vet for a recheck X-ray to see how the pelvis is healing.
Have the cat spayed asap.
If the cat presents with anal tone and deep pain in all four feet I recommend cage rest
The best option is surgery. If you cannot afford it try cage rest. They will be painful for a few day. A fentanyl patch might help or try buprinex. Ask your vet about these.
Let me know how she does
Yes definately take your cat to the Vet. Whatever is on his neck needs diagnosing. Its obviously infected from your description and also needs antibiotics. There could well be a reason your cat keeps getting these ulcers (if thats what they are) and it would be wise to find the source of the problem. Good luck.