Habit of doubting everything & panicking

I don't know what's happening to me. I've started questioning everything that i do, i mean as little as washing hands. I wash hands 2-3 times whenever i wash to make sure that i washed them correctly. I have to see my bottle filling up with water from filter or else i will have doubt of that water and I won't drink it then. When i touch something in my own house i wash hands just to make sure. Today i was walking in a park and one dog started barking at me, he came running towards me, he came close to me, he didn't bite me, he didn't scratch me with it's paw, nothing, but there is unnecessary doubt and i am thinking that i need to get vaccinated for dog scratch. I had covid in April and after that all this wierd thoughts started happening. Before that i loved dogs i would pet them and they put their paw on me and i didn't even think of infection. And now the dog didn't even scratch me and i am worried of horrible infections. My daily life is getting effected. Please tell me what to do?