My two attempts were 22 years apart. The first time, I stopped myself after I had started..... realized that I couldn't do it after all and managed to get myself to a doctor. The second time, I didn't stop but I was found "in time" by about two minutes (according to the doctor later).

But that second failure did NOT take away the option of trying again. Quite the opposite, in fact. I now know that I have an option. My therapist and I have discussed this at length.