I hope you read this, because you sound exactly like me when I had an 8 month old daughter.
I had OCD, health anxiety, and general anxiety too.
You have post-natal anxiety and it's common.
Please take my advice because I wish someone had told me this back then. When I finally figured out what to do, it transformed my life.
I tried to get help by the way through NHS, but I didn't fit the criteria for OCD as they only ask about physical compulsions. Mine was 'Real Event' OCD that mainly happened inside my head.
I also tried anxiety meds and they made me worse.
Please first start watching Ali Greymond on YouTube as a first step and see if it resonates with you re your OCD.
If it does you, please diligently follow the advice on how to overcome your OCD behaviours and compulsions. You might find, as I did, your health anxiety is also linked to OCD.
You have to lean into the anxiety, accept it, and then tell it to go away. Do not carry out compulsions, do not ruminate. It's SOO hard at first, but the more you do it, the more you train your brain to stop living constant fear that something bad is going to happen.
Post natal anxiety can continue for 4 years. I got better when my daughter turned 4, but only put these methods into place then, I wish I had started earlier.
There's light at the end of the tunnel I promise! But it takes work- I got better after 2-3 months, no meds. Although everyone is different so I'm not proposing you don't try that.
I really hope you read this cos it really feels like I wrote this all those years ago! I sometimes get bouts of worry but I know how to manage it now, and I can finally enjoy life and motherhood!
You can do it!