[KinksHunter]

Wah, I totally feel you man.
Respect for sharing your concern, really.
A lot of guys go through these kind of hiccups, and trust me, it can mess with your mood and self-esteem big time.

First thing's first, good job for trying out stuff like exercising, and even that half-blue pill.
You're exploring all the avenues, and that's commendable.

Now, let's talk about the mental game. Your mind can play tricks on you, like stress, anxiety, and overthinking can really play a number on your performance.
And that scenario you described – getting ready during foreplay but losing it after...
Could be a mix of both physical and "head" stuff, if you catch my drift.

You brought up that flying solo doesn't give you issues, which could point to the problem being more up in the noggin than down there.
Sometimes, we put so much pressure on ourselves to be top-notch, it messes with the whole show.
Open up to your partner, talk it out, and you might find that support goes a long way.

Props to you for keeping up with the usual exercise routine, but remember, this kind of thing might need some time to show results. Stay consistent, man.

If things still not picking up, maybe consider having a heart-to-heart with a pro. A doctor or a sex therapist could give you insights tailored just for you.

Hang in there, don't let this one thing affect you, hoping you'll be back on your bed game soon!