I'm sorry to hear this
I see this in myself too and I understand the anger you are feeling. I'll be going along "ok" and then one day I'll wake up and feel like I've lost a lot of strength. It makes me feel so hopeless and I have to learn to get used to a new "normal"
Every year I lose more and more and it is very frustrating. I find myself pulling away from all kinds of activities. I quit volunteering at the kids' elementary school because it's too hard to walk around all the kids running around. I can't go grocery shopping on my own anymore by myself. I don't enjoy family gatherings like I once did because I'm so different than all the others. I can't enjoy the same activities and I hate sitting around watching everyone else. I'd rather just be home. By myself.
Life does seem cruel. I hope you can find things that you can still enjoy doing.
And about the husband and boyfriend - I find that my husband doesn't always understand me or make the pain any easier!! It's hard for even him to relate to me. I often feel I am going it alone!