I agree, I was married to abusive narcissist and I put on 40 lbs. I didn't eat more, but the weight came on anyway. I started using energy medicine to treat me not wanting to be attractive to women, needing to be big to protect myself..etc. I started loosing weight without any diets or extra exercises. So far I have lost 30 lbs.
As far as conventional psychotherapy, it could help, maybe. Energy therapies are much faster and powerful.
You may look into EFT as a self help method, many find it more helpful that throwing money at a therapist. EFT is free to learn and there are good Support Forums that will help you to use it.
There are better methods than EFT, but it is superior to counseling in many ways and its FREE.