Animals can be very sensitive when you aren't feeling well. My next door neighbour (years ago) was epileptic and her cat would come to her when she was going to have a fit, and stayed with her afterwards. Your partner may have changed her feelings, but you've still got love in your life from your animals.
Maybe thinking about it differently than having been a total waste might help you feel better and have a better outlook? I don't know, but something to talk about with your doctor(s)? I know that there are issues there, but try not to focus so much on what isn't, keep a little bit of "maybe" in there. (I know, I know, easier said than done). Hang in there, nil desperandum and all that.
Maybe thinking about it differently than having been a total waste might help you feel better and have a better outlook? I don't know, but something to talk about with your doctor(s)? I know that there are issues there, but try not to focus so much on what isn't, keep a little bit of "maybe" in there. (I know, I know, easier said than done). Hang in there, nil desperandum and all that.