How to lose weight going from a raw vegan diet to a meat eating diet?

I was recently put on a high protein- meat eating diet because of my Anemia.

I am afraid I will be gaining weight since I had been a raw vegan for several months prior. I don’t know how to control this fear; my entire day revolves around the calorie intake I take in now, and if it has fat, sugar, and what not. It’s really frustrating.

Can someone give me some healthy eating tips eating normal food? So I can still lose weight?

How often should I eat?

Thanks for the help!