Does your Wal-Mart have houseplants? Just get an aloe vera plant, split open the leaves and rub the slimey juice wherever it burns - that should give you some MAJOR relief, major fast! (better yet, split the leaves open and pack the slimey sides onto the burn with gauze and/or soft tape).
If you have the money, order some Miracle II Neutralizer Gel (you can find it on eBay or anywhere on line); I've used it for years and never known it NOT to stop any type of burning sensations.