I Have Been Having Acute Abdominal/gastric Pain With Severe Bloating,

I have been having acute abdominal/gastric pain with severe bloating, cold sweats and vomiting. This pain comes on slowly during the day and usually peaks during the night. I had an episode last night and the pain was so severe it made me pass out. I have a lot of stress and anxiety in my live and have resorted to taking an antidepressant since last summer. The episodes seem to be getting worse but they only happen once every month or so. I am 71 years old and in good health. Can you give me an idea of what it could be. Thank you I advance.