I got sick a few years ago and was in your situation, at my lowest I was 5'4 and 80. After receiving treatment I did the same thing you did now, and gorged to gain weight, I didn't care about getting fat, I just wanted to put on some much needed poundage. I gained weight very quickly, and got my period back within the year. Upon retrospect, gorging was not the best idea. I put on a lot of weight around my stomach also and that took longest to lose once I was my heaviest at 126. I'd say eating 1900 a day is good for me, I was eating close to 3000 and nowhere near primal. You're on the right track.
F 28/5'4/100 lbs
"I'm not a psychopath, I'm a high-functioning sociopath; do your research."