Sexual issues after divorce

I got divorced nearly 2 years ago and ever since the divorce I have had issues with early ejaculation, even while masturbating. This happens with good looking women as well as with not so attractive ones. The only time it is not an issue is when I have been drinking a fair bit. This was never an issue with my ex, we used to go for hours and then overnight it all turned around. I thought time might cure it, but after 2 years, it is obvious time is not going to cure it. What is causing this issue? What are some ways to start fixing this issue? Thank you for any assistance.