Sorry to hear you so worried. There is no exact number of Calories because it varies so much with the person. I have some questions. What's your dosage? Also are you exercising even a little? Depression and Anxiety can make us lumps on a log. We don't move. I suffer from that. This makes us not want to eat or pretty much do anything else
Try adding small walks or try dancing or moving to some music.
Also try to eat small meals 5-6 times a day with additional fats.
This will help the appetite and the mind. Hope this helps.
I'm here if you need to talk.