Help with upping calories?

Scandinavia

Hello there! I am currently looking to up my calories after under-eating for about a year and a half due to an eating disorder. I did receive inpatient treatment and was consuming probably 2000 calories a day, however my weight never stopped fluctuating before I was released.

I went through a rough patch recently and have been under-eating again, usually staying within 1000-1150. The past three days I have eaten 1200+ or close to 1200 and have felt better, and have a net gain of 0.7lbs. I have never maintained my weight, ever. I've always been stuck in a weight loss/gain cycle, and I'm still young to have this issue.

I am 5'7-5'8 depending on where I am measured, and weighed 128 this morning. My question is, what should my maintenance goal be, and how should I get there? How fast should I increase my calories (all at once, or raise by a certain amount slowly...?)

Thank you in advance!

Edit: Forgot to mention that if you look at my diary, today is not very typical. I was sick with strep throat.

BarackMeLikeAHurricane

Increase it by 100 calories a week. I'm the same height and only 10lbs less and my maintenance calories are supposed to be around 1600 so a little over that. If you set MFP to maintenance it will tell you the exact amount of calories.

love4fitnesslove4food_wechange

Depends on how active you are. I'd assume if you're even reasonably active you should be eating at least 2000 calories per day.