Certainly your description matches my own experience of the early effects of osteoarthritis, which eventually caused me to need a hip replacement. If it occurs again, I do recommend you see your GP. If it is similar (and only medical advice can tell you that) a hip x-ray now may be a useful baseline in a few years time for assessing deterioration to provide evidence if you need surgery
There is something called snapping hip syndrome, which I had years ago, with similar symptoms. I was given exercises to do which sorted it, but I definitely endorse previous advice to consult your GP to determine the cause in your case.
I too have developed a worrying side effect from my daily walks. After about 5 mins of not too brisk walking my heel and the back of my ankle goes completely numb. Yesterday i turned round and came home straight away. With rest it goes away.I have herniated discs in my spine and am concerned that one of them has 'moved' again. Due for a telephone consultation this week for my medication so will mention and hope they call me in to surgery for gp to take a look. As i have been working most days in the garden i am concerned i have 'done' something to my back.