I suffer from compulsive eating i can't stop eating even though i'm not hungry what can i do?

i gianed over 40 kgs sincs i got married 4 years ago and i can't stop gaining weight and it's starting to affect my health i always suffer from back pain and knee pain. i really need to lose a lot of weight as soon as possible.do you think i need to see a psychiatrist first or go to a nutrition specialist