Nothing wrong with you at all. What I mean is, you aren't weird or unusual or bad at all. I know from experience some of what you are describing for myself, and I know others go through it too.

Some ideas:

Tell your med person about the side effects you've gone through and tell them about your sex drive. Also can you talk with a therapist about what you are going through?

I had to work, and am still working, on taking my own sexuality back. Figuring out what works for me, what I want to enjoy.

What if you have your fiance do what works for you, even if it doesn't involve that thing you're not all that into right now?

Also works for me to think about what is sensual in my life, doesn't have to necessarily be outright sexual. Maybe soaking in a hot tub with my sweetheart. Sharing massages. Finding lots of ways to express love for each other.

Good luck in your journey, I think you'll do fine.