Back to the O.P.
For what it's worth, I had the same symptoms that, in my total medical ignorance, I self-diagnosed as a touch of sciatica, a word I knew but did not really understand. I self-medicated with painkillers/anti-inflammatories which worked for a year or two. However, over time the pain spasms became more acute and eventually debilitating, until the memorable day when a searing flash of pain caused me to fall over!
Panicked into going to the quack, I had an X-ray and was diagnosed with osteo-arthritis of the spine, which seems to be just an elaborate term for "ageing". He prescribed a tablet (Diclofenac) that cannot address an untreatable condition, but does "scramble" the pain signals. Result! No more pain, no more problems.
Moral: you can run but you can't hide. Eventually you will have to see a doctor. If you do it sooner rather than later, you avoid the pain.