I feel you man..

I'm bipolar as well and I'm starting in on a low spell here soon I feel.

It's impossible to be happy and content all the time.. SO let that go right now.. You will have periods in your life that suck more than others.. It's just how the game works.

Mania is a gift and when you're on a roll you're on a roll. Irregardless of how shitty you feel you must continue on and wait for the mania to once again give you fuel to dare to dream..

I understand you because I live this every day. The mania is amazing but leaves you feeling empty and depressed.. My only advice to you is this.

Chin up, It will get better

Also, on the poles that aren't you.. Here is the fun part.. They are you. :)
It's just a matter of mixing them together and you find your character. <3