I have neck & lower back pain, also. I installed a " good quality ' adjustable stem & kept making adjustments to it, raising the handlebars, til i got a more comfortable angle. Didn't have to change any cables, etc. I could now buy a stem to match that angle, but I have just left the adjustable stem on there. Also, a more comfortable seat was added & a few # less air pressure in tires, too. Made a lot of difference . Take it easy & don't overdo it.