I think that you are an AWESOME friend! To me, you *were* being tolerant of her lifestyle and she, on the other hand, was not being tolerant of yours.
I'm a lady in my 20s so most of my friends are getting married right now, and as someone who isn't suited to marriage (but who feels that it can be a beautiful choice for other people) I feel similarly as you do about being left out. I'm also CF so it's kind of a double-whammy for me. I just don't feel like I can connect with many of the people that I used to connect with. However, I'm trying to remain optimistic; I'm even joining a group in my community that's geared toward one of my interests, so who knows: maybe I'll meet some cool people there who I can relate to.
PS I completely agree with you on the screaming thing! I can't stand noises, especially ones that are loud and sustained (not only do I have excellent hearing, but I have Asperger's so I have very strong sensory sensitivity, especially to noise).
I hope that you will meet many amazing people from all walks of life who treat you as well as you treat them--you deserve it! Good luck! ^_^