What is wrong with me help?!

For the past 4 years ive had constant tighness in neck and shoulders.It causes me to go dizzy and offbalance because it feels like it cant hold my head up.
When im walking sometimes it will feel like my neck is going to explode with pressure.
It sometimes can be really painful and i will need painkillers.
If i bend my head when i lift it up my neck will be so tight and im scared to be outside because il go dizzy at random times.
Doctors wont do anything,ive been so many times and they so "oh its just tension " but its ruining my life,ive tried relaxing hot baths,but even when im relaxed and calm its still there,even when i go to bed the tightness is there,especaily my shoulder blades.
What could it be ?they said i havent got vertigo .help im only 24 ?Also when i touch the areas of my neck and shoulders it makes me dizzy and i can feel it getting tighter like theres a band round my shoulders and lower neck.It drains me of energy aswell and i feel shattered and even hurts to swallow.
The doctor wont help