Hiker56,

If your only symptoms are headaches and fatigue, you could have an upper neck injury. It can disrupt blood flow and cause muscle spams that contribute to headaches. It can also interfere with sleep quality, no REM sleep, that can cause the fatigue.

Upper neck injuries are usually very subtle. They require gentle diagnosis and treatment, sometimes, just gentle treatment assuming a subtle upper neck injury. This can be a PT doing gentle traction and mobilization. It must be followed with good head and neck posture during rest and sleep. No thick pillows that lift the head. A good indicator is tenderness at the bony spot behind the ears. Lack of tenderness there does not rule out an upper neck issue. Some have found help at upper cervical chiropractors such a NUCCA trained chiros.

The traditional 'twist the head and pop the neck' chiros are often too aggressive for the subtle injuries suffered.

Some headaches are the result of vision issues. A behavioral optometrist can diagnose and treat these issues. You can find a local clinic at this link,
https://nora.cc/healthcare-locator.html

Don't be upset with your neuro. They often are not as knowledgeable with Post Concussion headaches and one would expect.

There is a lot of good information in the Vitamins sticky at the top. More than just vitamins. Links to NUCCA etc.