I have a dull ache/burning pain on the left side of my waist. It hurts mostly when I lay on my stomach to sleep and goes mostly away when I turn over but I can still feel something there. Doesn't seem to be diet or exercise related as it comes in goes. Just went through a series of antibiotics and no relief. If anything I've had weight gain over weight loss, but it's been there three months. I think it may be a hernia but they can't find one (my mom can't walk and I carried her about 3 miles on my back to see a cool waterfall and everything started right after that). It seems to run along the iliac crest and sometimes I've gotten a rash on the groin that coincides with the peak.   I've been treated for GERD, bacterial and antifungal , but to no avail.   It does go away if I drink  a few beers but that's not a solution and it's just really affecting my ability to move/get around cause it's a nuisance.