protein shakes are beneficial for muscle repairing damaged due to workout. it helps in building muscle and keep lean muscle mass. i dont think protein shakes are good for injury recovery. what kinda injury are u talking about ? if its a gym injury then its probably a torn muscle. better check out with the doc.
u did a "dirty bulk"..not cool.. its gonna take time to cut that amount of fat from your system. and also dude, cut the sausages/patties. and no, u dont get 3-4 pound of muscle that easily
if it was that easy to gain 3-4 lb of muscle, everyone would be doing a dirty bulk. goto bodybuilding site and check out for yourself how long it takes to gain 3-4lbs of pure muscle.since u just started. id recommend u to go for normal whey standard protein. its normal 14servings box is for 2160Rs. it comes in bigger size too so u can check it out.
there are other forms of protein like casein and hydrolyzed whey protein. but unless ur a pro builder who needs rapid digestion of protein i wont recommend u to go for hydrolyzed one.and your body isnt used to that kinda supplement either. so yea start with normal whey standard one.