Thanks for your query.
Regular perineal muscles exercise along with anal sphincter squeezing for 15-20 minutes per day may help you a lot . pre mature ejaculation is mostly due to tension or over expectation . Stop smoking
& alcohol also that will also help. Use of condom will also enhance your time of intercourse.
‘Hope I have answered your query, I will be available to answer your follow up queries, “Wish you Good Health and trouble free speedy recovery”