I Tripped Recently Losing My Balance. A Friend Was Holding

I tripped recently losing my balance. A friend was holding my left hand and didn't let go such that when I started to fall, my left side was held back and the front of my body lurched forward. I never fell down completely. I think I twisted muscles on the left side just above my waist. They hurt. Is there anything that I can do for the pain? How long should I expect the pain to last? and Is there any need to see my doctor?