Husband undiagnosed and very emotionally abusive

I am fairly certain my husband has undiagnosed and untreated ADHD. I could explain all the valid reasons why, but please trust me.

I am also currently going through IVF and have just had my second chemical pregnancy (an early miscarriage)

This is a very hard time for me needless to say. My husband has been unsupportive and downright emotionally abusive. I don't know what to do. He has said for months he agrees that he has a problem and will seek help, but he hasn't. Oftentimes he'll say he doesn't actually have a problem. Other times he'll say he is the worst person and get extremely down on himself and leave me, crying and scared. He did that today, and I literally just found out about my 2nd chemical pregnancy.  I am grieving and dealing with that.

I don't know why I am posting. I am very scared and alone and don't know what to do.