Primer will make your head hurt

I just finished watching "Primer" and all I can say is ouch. I honestly had a mind-nuumbing headache from trying to figure out what the hell was going on in that movie. The last time I was this confused I had just finished drinking 12 shots of Jagrmeister and I was trying to walk.
I think I am going to have to rent it like 10 times. I spent some time on the message boards but I think I am more confused now than I was. All that time travel can really screw you up. If anyone else has some insight please feel me in because I feel like a one-eyed cat in a fish store. Here is a link to the film:

Good luck.