Some Weeks Ago I Lifted Something Heavy And Got A

Some weeks ago I lifted something heavy and got a very sore stitch like pain in my left side around my waist area at the time the pain was so bad it knocked me to the floor, from then it has bothered me and I have developed gas and gurgling in this area . Sometimes I can feel the pain going down to my hip and lower back. Sometimes the pain feels sharp and other times like an dull ache. When this happend it felt like something has twisted inside. Do you think the gas problem has come from the injury or are there 2 things going on.