I'm repeating over and over a text cause I get a throught and so Everytime I delete it to restart what can help

I need advice. I’m constantly washing my hands after going to the bathroom/touching something I find gross, but it doesn’t stop at just washing. I have to keep washing til I feel right (usually 3-4 times). It also isn’t just my hands, I go all the way up my forearms. I know in my head that once is enough. But I can’t kick this repetitive behavior. I know I should just start only washing it once but I don’t know if I can handle the panic that will come after. I need advice/tips if anyone’s gone through something similar what worked for you. Im just sick of this

Two things are happening: I get thoughts that just keep looping. They almost feel like song stuck in my head. Also, I’ll imagine something and I feel my stomach drop. Then as the seconds go by I keep getting fragments of the this thought but with different details. For example, it’s kinda like how a “vision” is portrayed. I’ll get a glimpse of the thought and then it’ll rapidly expand into something worse every few seconds. I don’t know if I’m causing this or if it’s just an automatic thing like any other intrusive thought. It feels unavoidable, idk if this is a compulsion or if it’s just another manifestation of an intrusive thought. Apart from that remembering an intrusive thought triggers the full thought again and then it just keeps looping or expanding. I don’t know how to stop any of this. Help?

When you get a stuck thought in your mind, as stupid or untrue as it may be, how do any of you block them out, or try to at least? It’s like my mind has another voice telling me making up the stupidest things?