if your boss isn't going to give you time off sick then you might be better off not working there

i broke my back in 2 places about 16 years ago and it's got to the point where it hurts a lot when it hurts, but if i do nothing for a day it's good again
what you need to first sort out is what caused the problem, then stop doing it and then get your back sorted

there are 3 sorts, the muscle tweaked which is the same as a sprain, the traped nerve which is a pain and the disc problems which really fuck you up

you need to know which one it is you have so if your doc can't help you go to a+e and get them to look at it for you, or at least get you booked in for someone to look at it for you

sitting in a cab for hours on end isn't really the best way to go about it and might be the root cause of all your problems in the first place

get it seen too or you might not be able to do the things you want to do for the rest of your life, my cousins got 5 steel plates in his back held together with screws and shit which have to be tweaked ever once in a while