I am very moody

Try not to laugh.
You have to accept the fact that you can't just be happy.
Because the truth hurts in this case.
What comes after showed the truth that, you were living in the illusion of hapiness during that time.
You know what you were going through, it's the self defence mechanism in your current philosophy, it's to tell you that you shouldn't continue doing the happy thing which shouldn't/wouldn't be that happy anymore(it's mostly like (illusional) happiness that something wasn't in the consideration but is now, life changes, I guess).

Maybe it is time for a change.
Nothing lasts forever, you don't live forever.
They don't live forever, it doesn't exist forever.
Or maybe just try figuring(to figure) out what is going on for yourself can help you to get out from the moodswings.

Space will save you. Think just how small, but yet wonderful you are. :)

thats what its like to be a human being it sucks...

Control your emotions. Your feelings are your personal responsibility.