Hi welcome to Health care magic forum.
Tnks for choosing H.C.M.Forum.
You have Problem with stomach, Diagnised as spasming and inflammation and twisting. You are getting relief with serax
Whenever there is pain of stomach or intestines, there is severe contractions of the musclefibres which causes pain. some times due to skeletal muscle contractions there will be twitching and external pain.
Any how you got relieved of the pain so don't worry. this can repeate at any time so it will be a guide for you for further treatment.
Wishing for a quick and complete recovery.