I'm not sure this is anxiety or if I'm posting in correct subreddit for this matter but I will give this a go anyway and hope to be in a correct place. 

I don't know what is happening but I have often periods where I overthink too much about something then I experience stomach pains for days. This stomach pain is nothing like a normal stomach pain as it's way stronger. 

When I have such stomach pains I become very impatient. In top of that I can be very very agitated and minor things can set me off and when I get into a very strong argument, I have tendency to throw shit around because off all that stomach pain.

I went to a doctor and hospital for various checks but there is nothing wrong here. I went to a private psychiatrist and was prescribed sertraline which I don't think helps much as I still get stomach pains.

Before all this I was a very patient and collected person who's never threw shit around or showed any signs of visible frustration. This is more and more becoming a pain in the ass because I can't concentrate as much as I used to. I also tend to spend a whole day listening to music on my headphones as this helps me with stomach pain more or less.

Have anyone experienced something similar ?