Painful sex

My ex and I were together for 2.5 years; sex was amazing up until I got pregnant with our son. I was diagnosed with pelvic floor dysfunction and had pelvic floor therapy.. we ended up taking a break due to his drinking issues and overall just a toxic person. I got my own apartment with our son and ended up going through a “hoe phase” , sex did not hurt once with any of the three guys, and I always had a sex drive. Now, my ex and I are trying to work again.. I have no desire for sex and when we try, it hurts so bad! (I’m only 19.. so age isn’t a factor!)