Re: delayed ejaculation issue
OK one thing I'd say straight off is remove the pressure on yourself to orgasm. Sex doesn't have rules and if she cares about you, she won't leave. Also sex isn't a race or a competition. There are no winners or losers. Is she having orgasms?
Be vocal with each other, there is nothing worse than trying to second guess a partner. If you can't orgasm through sex, could she do other things for you? Give you a hand so to speak? Communication is key.
There's a possibility your meds could be a hindrance, but as above, talk to each other. Best of luck buddy.
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'It was a wedding ring, destined to be found in a cheap hotel, lost in a kitchen sink, or thrown in a wishing well' - Marillion, Clutching at Straws, 1987