That wouldn't be bi-polar then but Clinical Depression. Talk to a doc as soon as possible. The longer you delay is another day in hell. Hopefully they'll put you on an SSRI or Lexapro for a couple of months then ween you off while you work at therapy.
Depression is not a joke nor is it anything to be ashamed of. It can be very dangerous if left untreated. Hell, it's your quality of life we are talking about here, don't you want it to get better?
btw - I've delt a bit with mental diseasae in my personal life. Everybody from my father's ex-wife, sister, my neighbor, my current girlfriend, etc... The ones that seek help honestly see an improvement - those that don't, well...two are dead now from suicide and one went completely Paranoid Schizo and tried to hire a hit man to kill my dad - the fucked up thing is he still has to pay alimony to her and 'cause she's clinical she can't go to jail.
Good luck rippedboy, you gotta treat this like a fever or a broken arm. Stop the pain, figure out what's wrong and then rehabilitate the damage. It's not easy but neither is weight training.