hello and welcome.i had same problem and was diagnosed after various tests and physio then mri scan as having L5/s1 prolapsed disc.
i would see a chiropractor or spinal surgeon if this does not settle.
this is an opinion as i am a supporter for the forum.
they can put you on medication and try physio for to maybe pop it back in.
it may also be siatica which can itself put you through hell with pain.
my advice would be see a proffesional and have them examine you and get proper diagnosis as soon as you can.
hope this has helped you

you need some ultram,it would relive your pain once its taken.i can refer it to you online