left side stomach psin

Hi
I wonder if anyone can relate to this? 4yrs ago I had this same pain- its in my lower left side, it goes into my back at the same side almpst feels like a bruise, into my left hip. The Dr told me it was IBS. It. Went on for so long and so painful my husband said we should try yorktest for intollerances. This told me I was intollerent to gluten/wheat. I laid off it and within 2 wks was pain free after about a year of pain. Everything has been great till now and the pains back. I have not changed my diet but its as bad if not worse than previously. The pain can be burning, stabbing, knawing its very uncomfortable and even the pain goes onto my left leg at times. I don't have any trouble going to the loo once a day no problems. Please can anyone suggest what I should do ? I'm desperate as this episode has been here since Christmas.  Thanks Guys