My Son (21) Was Wrestling With A Friend And Hurt

My son (21) was wrestling with a friend and hurt his neck muscle and he is in a lot of pain. There is also swelling at the spot of injury. The doctor at the hospital gave him a shot to ease the pain and vAlium. She also prescribed ibuprofen 600mg and diazepam 5 mg. However, today - 1 day later- the swelling seems to have increased in size. Is there something he can do to help ease both the swelling and the pain?