I have a intermittent but constant vibrating sensation in my back passage area that has persisted in the last few days

at first I was checking my phone in my back pocket but soon realised that it was internal!  I have had piles and successfully operated on although I do have the occasional problem if I lift

or strain.  A few years ago I had a car accident which l left me with two fractured vertebra which when diagnosed some 8 months later were a  permanent feature of discomfort.

Can you advise or explain as I find NHS impossible I am still waiting on physio therapy from last year.