Yesterday around mid-afternoon I experienced tightening in my abdomen area.
Start things gradually.
Hello dear and welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
Your symptoms seem to be related to the protein shakes you are having. A sudden change from normal food to high protein with appetite suppressant usually causes gut upset in most of the people after a few weeks.
Tightening of the abdomen is suggestive of the fact that gases are formed inside intestine by fermentation of proteins these gases causes inflammation in intestines leading to spasmodic pain.
Take lots of fibers with your shake so that body could tolerate high protein diet. Increase the supplementation gradually otherwise you would either end up having loose motions or constipation.
Take a soft diet for a day or two.
Banana, toast, apple sauce, and rice would be okay.
Take probiotic capsule like VSL#3 for three days.
Activated charcoal tablet along with antispasmodic like Dicyclomine 10 mg twice daily for two days.
Once you start feeling fine, start shakes etc. gradually.
Hope I was helpful,
Follow-ups are welcome,