but he hasn't eaten since october! I'm really nervous that its dying =[
& Now its having trouble shedding the upper half of the body sheds but the lower half isn't coming off.
Given the animal is eating medium rats I would assume the animal is couple of years old with a good body weight which means as long as your animal is healthy and well hydrated he will be OK. Adult BP can go months without food.

Now your role is to figure out if you can do anything to help your BP resume feeding in the event this would be husbandry or stress related.

If everything is on spot (well almost everything obviously there are humidity issues) you might need to wait it out.

Address your humidity issues check everything else, try offering smaller preys weekly (small rats 50 grams or so), make sure is your BP is healthy and well hydrated and wait for him to resume feeding.