hello. I am 19 years old and twice in the past week i have woken up to the worst pain in my lower back on the left side. The pain is absolutly horrible for 30 minutes and then goes away. While I'm in this pain I can hardly move and it increases whenever I do move. Since my apendix is on the right side I figure it's a severe muscle spasam but the pain is so bad that I think I should see a doctor about it. What could it be?