Hi Jeans, that sounds just like a problem I have recently had (and still have at the moment) but had no idea what it was. It's actually one of the main reasons I am on a diet, I knew it was likely to be weight related after piling on yet another stone.
It's a very painful heel and aching arch of the foot, I hobble and limp about all the time, but especially so after waking up in the morning or after sitting down. Funnily enough just recently I started wearing shoes in the house (a big no no usually in Denmark
haha) and the pain has improved considerably, we have very hard floors so I guess that might have been it. (going off to buy myself some attractive Dr Scholl's later today
Really hope yours gets better soon, it must be rotten needing injections.