what do i do about an old shoulder injury?

[gtypetroop]

about 3 yrs ago i got into a scuffle with a bigger dude..i wuz winning but he ended up on top as we both fell..i had to reach within to generate the strength to twist him off and commence to pummel his face(he swung 1st and missed,had to defend myself)..didnt notice right away after(adrenaline) but later my shoulder muscles were weak and pained..now today there is cracking sounds when i move in certain motions,and pain when i sleep on that side..dont have 100% strength..whut should i do, or can i just expect stiff shoulder syndrome for the rest of my life at this point