How to tell husband I'm depressed

How can I tell my husband I have postpartum depression? I'm a person who always hides their angry or upset emotions so I don't think he will believe me, he's never seen it with his family and I'm 100% sure he will compare me with his side of the family and say he's never seen them experiencing it before

I'm so stressed, I'm always crying and tired and so scared and I always get depressive thoughts. I want to tell him so he understands me, and maybe he will help me but if he turns around and says stop making it up I think I will lose all hope in getting better.

I go to a psychologist but I don't even tell him that 😢