I have found that people who are depressed or unhappy about their own lives cannot celebrate or share in the happiness of others' successes. It comes from envy, and not being able to feel happy for someone else because it's almost like a dig at their life if yours is going better than theirs is. It's not right and it's not fair. But if this is a repetitive issue within your friendship, I would consider dropping this friend. True friends are able to be happy for one another, no matter what is going on for themselves.

Congrats on making a doctor's appointment! Hugs.