Anal Fissure?

Has anyone ever had an anal fissure? I think I do, but am unsure. I was prescribed antibiotics about a week and half ago, and over the course of treatment, I had diarrea. It was super liquidly and would occur at least 3 times a day. I think my butt got super irritated from this and may have caused an anal fissure? Is that possible? I don’t do anal, but every time I go number 2, it’s extremely painful, almost like a burning sensation. No blood whatsoever though. Thoughts anyone?