Omg I experienced the same thing for about a year. It gradually got worse and worse, it prohibited me from walking...I legit felt house bound and the pain just increased crazily.
It could be a nerve issue or you could lack vitamin D (my doctor said there was a link)
I'd strongly suggest you to see your doctor or even the hospital ASAP! You don't want the pain to get any worse. My pain hasn't even almost dissapeared and I noticed it gets worse when I'm not active, so I make sure I'm active everyday.
Please, if the pain increases, GO TO A&E! (Even if they say it's a gp matter demand you see a doctor because I understand how long people wait for an appointment at the doctor surgery)