Definitely seems that way to me too... I don't think I've had much 'time off' really since about Summer 2010. Had a major 3-month high then, working all the hours I could, sleeping 4-5 hours a night. Then crashed October 2010, depression built for months, went psychotic in Feb 2011, into a mixed episode March-April 11 - hospital - then depressed again May-October better than before but generally low, then up again in October-December 11, but peppered with crippling anxiety attacks in the middle of the night, crashed in January 12 again, off work for 4 weeks, had a few weeks where I managed quite well but now I'm up again. I feel quite powerless to resist it and I am trying really hard to be sensible!
I wasn't diagnosed properly until last year, but I've had the same sorts of ups and downs since (I think) my teens. They were easier to cope with and spaced further apart until recently - only asked for help when the depression got bad, but they just chucked ADs at me, which never worked and I eventually got better with nothing so I just ploughed through.
I'm 37 now. I have read bipolar gets more intense with age. Not looking forward to it, if the past 18 months are a sign of things to come!
Sorry you're feeling crappy by the way. Hope things improve soon x