The recommendations below are quite obviously very good. I would watch the area very closely, and pay attention to what the snake is doing and how it is acting. Keep treating the area with what you have, and things should take care of themselves. I once bought a large boa constrictor from someone near my home. When I got him home, I checked him out, and noticed a scab on his head, right between his eyes. Curious, I picked at the scab, and with little effort, the scab came right off. Hanging on to the scab was a big (and I mean big) plug of pus. What was left was a gaping hole in the snake's head. Don't know what caused that injury -- I didn't ask the previous owner. I remember treating that wound, and it eventually healed. I can't remember what I used to treat it, but it something around the house (I think I used peroxide from a medicine dropper to wash the wound out). I'm not sure what this has to do with the bite to your snake, except that you may want to watch it and see if the wound reacts similarly. If it does, clean it out and make sure it doesn't get infected.
As far as alternative food sources, anything with feathers should work. I've used small ducks, quail and chickens of various sizes. Be careful with chickens grown commericially for human consumption -- they are often given hormones, steroids, etc. A 7-foot Burm could easily scarf down as many quail as you could supply. I would try appropriately sized chickens or ducks if the need arises (many years ago, I once fed a small retic an owl that flew in front of my vehicle and got stuck in the grill --- the impact obviously killed it, and the snake didn't seem to mind; wouldn't do that now, though, and I don't recommend it at all). But before I offered fowl, I would offer a small pre-killed rabbit. And if the snake refused, I would try every trick in the book to get it to eat a rabbit before I resorted to feathered food.
RP