I Battle Depression

I feel it coming on more often lately, I feel weak and worthless because of it, there are days where I'm happy and even thankful to be alive, I busted my ass to get to that point, there have been many times I almost lost the will to keep going (not suicide but just give up on hope for example). I honestly feel I am burdening those who I do talk to, I just wish this would stop, one day I'm happy the next I'm sad or angry. Sorry for the rant I just had to let it out