Originally Posted by ItsTheWooo

It takes awhile for the body to recover from amenorrhea related to stresses like rapid weight loss (whether from exercising or restriction), and nutritional deprivation. Keep eating more foods and hopefully it will come back.
That's what I'm doing but no sign of it yet.

Another possibility is you might simply be too thin for your body. You would have to gain some weight back to restart your period. 108 lbs at 5'4 is underweight for the average, and your body might have an above average set point. Clearly you can see the problem if this were the case . My weight is similar and I'm 5'5, and also amenorrhetic. I'm currently eating more foods and hoping that as I maintain it will come back... and trying to gain weight (but must admit I really really don't want to and am not trying as hard as I could be ). If it doesn't come back I'll eventually put on weight but right now I'm still to insecure with weight maintenance to do that.

I don't know how afraid you are of slipping and regaining out of control. If you aren't I would suggest putting on some weight back ASAP. If you aren't then for now just try to eat more calories, reassure your mind that this won't make you lose control and gain... and then when you're ready, you can feel confident enough to gain a few pounds. In the meantime you might want to investigate getting on birth control to supply your body the hormones it needs that it isn't producing.