Suggest Treatment For Severe Mid Abdominal Pain

Have experienced fairly severe mid abdominal pain on my left side twice in the past month. Pain came on gradually right when I went to bed and increased in intensity to a point where I seriously considered going to the Emergency Room. The first episode lasted approximately 40 minutes and eventually eased off to where there was no pain. Last night I had another episode of the same thing except the intensity became less but continued for several hours and finally subsided to no pain. These are the only times I ve had something like this happen. Any thoughts on what it could be or should I be seeking medical help soon?