Does anyone know how to tell which arthritis you have.

I know i have osteo in my spine and hip but wondered if it is RA in my hands. Swollen joints with nodules appearing. Early morning stiffness all over and constant pain. It seems to have got worse since i had covid which makes me wonder if i have RA as well, as the virus attacks the immune system and i believe RA is linked to immune system. Please correct me if i am wrong. I know the last blood test i had done said i have raised markers for inflammation but my gp..... over the phone of course..... didnt explain what that meant exactly.