I need help, my family doesn’t listen to me

I have major health anxiety, major. I can’t function throughout the day, it’s hard to take care of my 2 year old son-and it’s ruining my marriage with my husband. I am in constant fear that I have cancer. I’ve had every cancer in the book according to my brain. I’ve seen the doctor multiple times due to nothing. I’ve went in thinking I’ve had brain cancer, breast cancer, cervical and ovarian cancer, throat cancer, and my newest one is melanoma due to a mole I have (even though I’ve gotten it checked out by a skin cancer specialist). I constantly seek reassurance from anybody that’ll listen...even though I sound insane. I google CONSTANTLY. I manage to find pictures of moles that are cancerous that look exactly like mine...Doctors have referred me to counselors but they don’t seem to completely understand. Are their physiologists that specialize in hypochondriacs and major health anxiety? I have a 2 year old and I’m currently 21 weeks pregnant and I’m starting to feel majorly depressed over this, because cancer thoughts never leave my head and i don’t know what to do. Someone please guide me in the right direction for the next step?