I have had this problem for 12 years now... I had shots in my heels, ultra sound... stretching in the morning with balls, vegie cans, etc...
the only thing that worked for me is birkenstock sandals.
I wear them most of the time, for about 3 years I wore nothing but birkenstock clogs, you have to get the right pair, with a low heel cup. keep them by your bed, wear them all the time.
I also got the walkfit shoe inserts from tv for 20bucks and also put them in mens shoes, I found that the arch support is different in mens shoes, than in womens.
taking breaks also helps.
I have a job where I stand up all day long, and if I don't take breaks and sit, just for a few minutes, I get more pain.
it has been better with the walkfit inserts. you have to get used to them though, they have 3 different arch inserts.
the birks are really good though. sometimes you can find cheap versions, I found some at
walmart, clogs, looks like toe imprints in it, they work but wear out faster than the birks.
My son in law has them and he is thin, he had surgery on them and guess it has worked out for him but I just never had that time to take off work. besides I would rather do anything than surgery!!!
losing weight I do believe has helped me though, I am on weight watchers and have lost 27 lbs. so far.
good luck, and keep trying different things until you find something that works for you!