Since you acknowledge a clinical mood swing disorder, you have to choose someone who is willing to be with you in spite of this issue. You have a compatibility challenge for the long run, and while it’s not insurmountable, you have to be careful in choosing well.
Your ex-girlfriend does not sound like someone who wants to tolerate your condition. Since you’re aware of your own feelings and will be devastated if she eventually tells you she’s not interested again, my advice to you is very clear: This is not your Ms. Right. While she may have wonderful qualities and you have your “own special language” those are not enough to sustain a relationship with you. You need someone who is more understanding of your situation and less sensitive to your mood swings. Keep looking!
I hope that helps, and that you’ll follow me @AskAprilcom on Twitter! 😀