Nothing worse than having injuries get in the way when you are doing so well. I broke my foot and ankle successively and they took a very long time to heal: but exrays showed there was extensive damage. In the end, the doctors said they wouldn't advise surgery unless I was in a lot of pain or was an athlete who needed it fixed. I opted to let it heal on its own.
Every now and then, they act up; I'm sure the weight didn't help, but I have to be careful to walk on smooth surfaces; you know, watch out for 'gopher' holes and such ~ LOL!
I agree about doing other types of exercises like swimming, upper body stuff like TAI CHI, YOGA, PILATES, chair aerobics, weights, and anything else you know that won't aggravate your problem more. Maybe you should see a foot specialist if the condition persists after you switch to the low impact exercise (maybe after a few weeks). Depending on how severe the issue is, it should only take a few weeks to clear up; if it doesn't after that, it may be more serious than you think ...
PS ~ I always have to make sure that I wear really good quality shoes now too (whether it be athletic or professional loafers like Tendertootsies); they must give good support and be comfortable for walking.
Hope you find out soon ~

ROSEBUD