Prescribed Vyvanse…urge to binge is gone but I still feel hungry?

I have struggled with BED my entire life but last year I developed atypical anorexia and ended up losing 100lbs. I started therapy and completely stopped my restrictive behaviors but swung back into my binge eating disorder full-force. For the past two months, I’ve been eating somewhere between 4000 and 7000 calories every day. I finally went to a doctor and was prescribed Vyvanse. I no longer have that insatiable urge to stuff my face, but even after eating a normal amount of food with tons fiber and protein, I feel hungry. My stomach constantly feels empty and like it’s on the edge of growling. I don’t know what I can do differently…I’ve been chugging water to fill my stomach up, but the hunger only subsides for five to ten minutes before coming back. Has anyone experienced something similar? I’m hoping that my body will adjust after eating normally for a while. It just really sucks to feel starving all the time despite eating what my body needs.