It seems the word you want to google for is "Fetozid".
Google helpfully offers up images without even asking when it finds some, which is great normally, except in this case it isn't. Really
So, you may not want to google it, after all.
I found the German wikipedia article quite OK in this respect: https://de.wikipedia.org/wiki/Fetozid
Though it certainly points out how controversial the whole thing is.
My guess is that OPs doctor more or less ruled it out. It's normally only done if the health of the mother or the babies themselves are in danger - which he/she doesn't see.
AFAIK, you could go "doctor-shopping" till you find someone who does it.
Doctors aren't gods. But IME, it's not very wise to question the expertise of a doctor. You can always get a 2nd opinion. But if the 2nd and the 3rd and the 4th all tell the same thing, there might be some truth to it after all. And then it's time to step back and ask yourself if everybody else is stupid or if you're just wrong.
I know you don't want to be judged (happens anyway), but you should really think that through.
If everything goes OK, you'll have one child.
Are you going to tell him/her at some point?
What are you going to say?
If you're not going to tell, I'm pretty sure it's going to eat your soul, one way or another. Well, at least it would for me. And I'm "just" a man, my connection to my kids will never be the same as that of a woman.
Then, there are all the medical problems that could arise later in the pregnancy.
Even if you find someone here who does it - obviously, it's not done very often here. Medicine is, at its heart, just a handcraft. The more often a doctor does an operation, the better he gets.
I certainly wouldn't want to have such a thing performed on me by someone who does it maybe a handful of times a year.
I found this doctoral thesis (in German, but written at USZ): http://www.zora.uzh.ch/85312/1/Dokto...r_02062013.pdf
Don't know how well a google-translate of it turns out, but it's very interesting.
Maybe they've got an English version of it, or you can have it translated.
Or just try to contact the authors directly.
It seems to confirm some of the things I guessed above.
One takeaway: before week 13 of the pregnancy, it's much less bureaucratic - but after week 13, you basically can't have the procedure unless there's a medical indication!
Anyway, good luck.