OK. We've now learned that you've been wearing an entry-level shoe designed for recreational runners who need cushioning rather than stability. Time to get the right marathoning gear for the dynamics of your feet.
For some reason you've become enamored with Brooks shoes. No problem. Find a running specialty store in your area w/ knowledge sales people. (hint: do NOT go to a Bob's, Dick's, Athlete's Foot, or Sports Authority) When you get there, compare the Asics GT-2150s and GEL DS Trainers with comparable Brooks models. Do not let anyone sell you a motion control shoe; it'll be too rigid for your feet. I would advise you to stay w/ Asics unless you prefer the fit of Brooks equivalents. BTW: most Asics shoes should be purchased 1/2 size up. That's pretty common.
A few great retail options in your area. These guys will take care of you!
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