It is not someone else's job to make you feel better, only you can do that with your own actions, not thoughts, as you have seen with yours; you get in further difficulty by thinking someone cares/does not/has hurt you, based on only one incident in a whole history of a zillion incidents of a relationship. Think about and remember the "usual" of your friendships; J has your back normally and called to see how you are. Don't let the drop of can't-help-at-this-moment turn the good into all bad?

I wondered what happened to having time off to heal after your procedure and your plans to go to the art show Saturday night? You made that in advance and had decided that was what you were going to do, why are you swayed by what others have planned and are doing? If you tell your friends you are having a procedure done and are taking time off to rest, why would you expect anyone to call and invite you out or for them to be sitting at home hoping you would change your mind and call and invite them? Other people are just as complex as we are and have their life they are living; it's great when they intersect but their life isn't about what you are doing and your schedule, it is about their own. You have to be planning and doing things (how would you have liked if a friend had called and said, "Oh, don't get the procedure done that day, I'm having mine done then and want you to come over and cheer me up instead"?) and let others know and they are interested, like you were in going to your friend's show. These things can't come together just in your head, it takes actual events and things you are doing to attract others or be attracted to.