Coming to terms with ppd

How do I even go about telling my husband about my ppd, it’s been weeks and I’ve hidden so much from him hoping it’ll go away.

It’s just getting worse, I can’t go a day without a thought I feel too terrible to even voice here.

I don’t know how to tell him (or anyone else for that matter) I feel like a horrible person. He’s so extremely happy, I don’t know what to do.