Should I gain?

I used to be frequent on here but not so much anymore. Im 14 and I have anorexia. I gained from 88 to where I am now at 111. Im 5'6.5 so Im still underweight. I was eating 3000+ from November from about a month. But I stopped because I thought I was binging. I gained and lost from then to about March. Where I sit at 111. I dont know if I should gain the last amount. I drink alot of water before my appointments so my doctor thinks I weigh 117. What should I do? and if I should gain how many calories hould I be eating?

P.S In the last 3 months I have also developed bulimia, nobody knows that though

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