I/m an avid walker... you sound you like you have hip bursitis and plantar fasciitis... so what happens is there are all these bursa everywhere, and if someone does sports, walks/runs a lot, sits in a cushioned chair too much.. this is what happens. Ice is the best thing. Ice it for 20 minutes 3 times per day. Ice decreases inflammation. Heat makes it worse... makes the veins dilate and push on the bursa. Sit on hard chairs, not cushioned. Google hip bursitis stretches and plantar stretches. I do the stretching and ice and it helps when it really flares. WHen it is not all that bad i skip the ice but have to stretching every day. Worse in the morning... because i haven't moved all night from sleeping. Improves with exercise but then comes back. So the key is do lots of stretching multiple times per day. All day at work at my desk job i am constantly getting up and stretching and switched my soft chair to a hard chair. The bursa are on the outer sides of the hips, going around into the buttock, and pain can go down side of outer thigh. This is the advice a doc would give you (to save you some money). So your answer is you need to stretch, ice, repeat. It is extremely common and nothing to worry about.