Hi Julius,
POIS in a relationship is not simple to manage. I have decades of experience in this matter. I have already underlined the fact that, in order for a relationship to lasts despite POIS, you have to be with a person who is truly a generous person, centered in the heart, and who is also intelligent above average, enough to understand the complexity of this rare and disconcerting disorder that nobody has never heard of.
Even then, it is not easy. I have used, some years ago, a specific strategy that is, my spouse would climax, but not me. It took sometime before she became at ease with this, it's not 'normal' in our culture, and POIS could be the only reason in the world why a man woudn't want to climax at the end of an intimate relation. It took also some time for me to get use to stay with this high stimulation without releasing it. Lots of yoga, exercise, meditation, etc..... to put out the fire. Take note that for other POIS sufferers, they have symptoms from sexual stimulation even if they do not ejaculate, but that's not my case - I will have POIS only if I ejaculate.
It is important to underline that developing my pre-pack has made my life easier, a lot easier to manage. I couldn't go on with 2 to 3 days of becoming an exhausted madman each time I had a release.
You may find, on this forum, some suggestions that could bring you some relief. Even 50% to 60% relief could make your life much simpler, in a relationship.
About when to disclose the fact that you have POIS, I suggest it's not right from the beginning - but that's just my opinion. That implies that you will not have sexual relations right from the start. As I have underlined, you have to be in a relationship with a kind and generous person, and not in a superficial relationship based on sex and physical satisfaction, if you want this relationship to last despite POIS, because as you know, POIS makes a realtionship really difficult in many aspects. I know this is becoming rare nowadays to find people that are not putting emphasis on sex, but it is not realistic for someone having POIS to engage in a relationship where sex is very important ( unless you have developed a method to relief 60% or more of tour usual symptoms).
However, around the time you may begin to have full sexual relations in a relationship, the subject of POIS have to slowly being introduced, if you feel the other person has a chance to understand and accept this singular condition that you suffer from. It may end the relation right away, but if it does, it wouldn't have last anyway.
At any rate, developing a way to relief your symptoms, at least a bit, is the one factor that will be the most significant in increasing your chances at lasting in a relationship, and making your life much easier. Take a look at
http://poiscenter.com/forums/index.php?topic=2338.msg19448#msg19448 in see what in my chart can be safely tried in your own situation.
I hope this will help you in your reflection.