Day before yesterday I hurt my heel. I think it's a blister, but I'm not sure. I wore my old worn out tennis shoes that I have been wearing every day for three years. The inside of the heels on the shoes has worn out and lost the padding. I wore a pair of thin socks, went on a couple walks with my hubby and noticed my shoe was rubbing my heel due to the thin socks. Wore the same shoes yesterday with thicker socks and a band-aid. Didn't go on any walks, although I did go to the barn twice and worked in my garden. Today I can barely walk on that foot. The back of my left heel is red, but not swollen. I think it may be a very deep blister. If not, I don't know what it is and have no clue how to treat it. I want this to go away quickly. Any suggestions? (Please don't tell me to throw away my most comfy favorite shoes!) I usually do my grocery shopping on Sunday, but am not going today because I don't think I could walk around the darn store.