One second lover

Patient: The last few times my boyfriend and I have made love I have ejaculated within seconds of him entering me. He can continue to preform on me, but when it’s time to switch, I’m flaccid and no matter what I try, I can not get hard again. It’s becoming a big problem. I want nothing more than to satisfy my man. I would perform oral sex on him, but I’ve got a real bad gag reflex. What can I do to fix this? I want to give him the same feeling as I enter him as I get when he is entering me.