first
next--take a deep breath and relax!!!
ok, your body is working mama. it just takes a while for everything to get regulated. dont stress over it. It will happen. I'd be willing to bet that by no later than 3 mos. (and probably much sooner), you and babe will be doing great w/ no problems. So, thats at least 15 mos. of easy, simple bf. (if not longer). YOU CAN DO IT!!!!
I wouldnt do anything to decrease your supply. It will adjust itself. You just have to give it time to happen. I, too, would be afraid of trying to decrease and then not have enough. It is a natural process, let it happen naturally.
The quicker you sit back and relax, and let nature take its course, the quicker it will all start coming together. Just continue to take her off and catch the milk while it sprays (either w/ a cup, towel, dipe, or whatever is easiest), then let her latch back on. I would only feed on one side per feeding and maybe stay on the same side for 2-3 feedings. I've always only fed on one side per feeding. it is much easier than feeling like i have to switch all the time. (I did the switching w/ 1st dd, and it was a pain in the butt). Both dd #2and 3 have done well w/ one sided feeding.
I wish i could be there to give you support and help you through this. I wish you could've been here when I was having these challenges w/ #3, so you didnt feel like it was just you.
RELAX AND LET NATURE WORK!!!! YOU WILL GET IT!!!!
(and i'm not yelling at you, just emphasizing in case you quit reading all my mumble jumble.)