I have a similar issue with top of foot pain that comes and goes. I am not a doctor, so cannot say whether we might be dealing with stress fractures, but I found a few things helpful. When it acts up, I do a series of foot massages and exercises that I found on youtube. I replaced the orthotics in my running shoes, I sometimes use banded arch supports during my walks and runs. I make sure I always do planks with shoes on. Simple stuff, but I have come to the conclusion that there are ligament issues going on and try not to automatically assume that osteoporosis is to blame. That’s me, again, I am not a medical professional. If it was a constant problem, I would seek the advice of a physical therapist..