What would cause pain in the left side under rib cage. it is consistently coming every 5 or so minutes and lasting 10-15 seconds.?

GI spasms?: "stomach pain" can be caused by lots of things & may indeed originate outside the GI tract. Further evaluation is in order before anyone can answer "what to do." your doctor will want to re-examine you as well as know the quality, timing, duration, location, & associations (eating, position, activity, stooling, urinating) of your pain to better direct the next appropriate testing.