All your history suggest your antigravity muscles which make you stand, walk, follow a good posture are very weak, you might be having indigestion issue aswell.
The only solution is to work on these antigravity muscles first and foremost solution.
The Exercise you can start with link is given below.
Use any ball for doing this, best is Swiss ball, or basketball or foot ball for Doing this exercise.
Link of Exercise is given below:
https://youtu.be/MiFldyOU60o
Second comes your headache relief and eye ball Strengtening Exercise:
https://youtu.be/xpqMawlqtVY
Take care of your posture:
https://youtu.be/U9Lfbj-YVEY
Next Steps
Do respond after doing these Exercises, for 3 days. Tell about improvements and if any doubts you can contact.
Health Tips
Don't ignore yourself, visit a Physiotherapist soon for best results.