I've been super stressed with health anxiety. I've been having these buzzing/vibrating/internal tremors in my lower left abdomen/pelvic area.

They come and go in waves. It feels like a cellphone is buzzing inside me. It lasts like 2-3 seconds and go happen every few seconds for a few minutes or even up to an hour. There can also be times where i don't feel it at all. 

Had some blood work done, did and endoscopy and colonoscopy and was diagnosed with gastritis mild. This all started when i was stressing over biopsy results and now i cant shake it. Been almost a week now.