Thanks for the query
is irritable bowel syndrome
which can only be done after excluding all other causes for your problem.
Have u undergone colonoscopy
and an endoscopy? I dont think u have because u wud have mentioned it otherwise.
Since u have been missing your periods, plus having abdominal pains, plus cold
feet. I see something which are multiple medical problems. I best thing would be to get admitted and evaluated thoroughly.
Seek admission in a multi speciality hospital only
Have a healthy life