Anorexia Recovery & Treatment

I re-started my recovery yesterday, narrowly avoiding a re-admittance, however i am still on admittance list if i slip up because they said this is my last chance. My BMI is 15, at aged 16. I am going straight back onto a full meal plan. This may seem extreme and sudden, but i actually think its best for me. The only problem is i am gettin a lot of trapped wind and sever stomach ache. I get dull aches as well as a stabbing pain. What can i do to relieve it?
Ive also noticed a sudden increase in bowel movements, including diarohhea.