Wow, I loved your message — thanks so much for your response! That’s what I get for using Google translate! But double ache works if both people are aching for each other. I have a friend who had a vanishing twin sister and he is a bonafide chimera with 2 sets of DNA, one male, one female.
Zwillingsschmerzen would also make a great word, but the doppelschmerzen die has been cast and so it shall stay.
Thanks also for the link! I’m constantly looking for international keyboard symbols so this is getting bookmarked. You are a great font of information :)