Thank You for sharing this! I haven't felt happiness of any form in over 4 years and I really sympathise with you. It is such a relief to know I am not the only one as no one else I have found understood what it is like. Its hard because I have so much to be happy for but I don't know why I cant be. Its not depression but one day it will change. Because if it didn't I would hardly bother with anything at all. I've found the only way to get by is by trying to make up your own happiness by looking for the good we over look it.
Good luck you have my best wishes