I agree with the other answers, in that, you need to get some good, wide, fitting shoes broken in and get some cotton diabetic socks. The kind I like are : http://www.amazon.com/s.html/002-1673768-8761668?ie=UTF8&me=A1C3U2V2RUMVDE&brand=Ames%20Walker , I like the 185 or 130 style.
You may want to rub or spray your feet with antiperspirant (not deodorant) before you put on your socks. This will help keep down the sweat on your feet and it has a bit of an antifungal quality if it has zinc in it.
To get the blister to heal, clean it with benadine solution (this will keep it from getting infected and dry it) and use either rolled bandage or just fit the pad of a bandaid in between the toes while you are not running. Make sure while you are not running that the shoes you are wearing also are wide enough. When possible, go in flip flops this week to allow the blister to dry and heal. After you have cleaned it with benadine (should be in the disinfectant section of any store, ask a pharmacist's assistant if you cannot find it), make sure the skin flap is neatly trimmed off with a sharp cuticles scissors or something like them.
You may want to buy some of those very expensive (about $5/pair) rubber/silicone toe covers in the foot section of most stores. They look like spongy ring wraps. If you use them more than once, make sure you wash and dry them at night, maybe with a little benadine.
Benadine is red and will dye anything you happen to spill it on. It is an Iodine solution that doesn't sting, but smells. So it turns paper blueish, due to the starch content.
Good Luck. You are getting so much advise, how can you lose!