Anal fissure 4 weeks postpartum

I’m 4 weeks postpartum and every time I have a BM it feels like glass is cutting the inside of my butt, and it stings on the outside too. I’m terrified of going to the bathroom now cause it was way worse today. I literally cry from the pain. What can I do?? I’ve stuck witch hazel pads between my cheeks and I’ve used cortisone cream right on it. I’m not sure what to do 😭😭