People are tired for many different reasons such as not sleeping enough, stress, and underlying health problems like anemia or thyroid disease. I would recommend that he eats well, gets enough sleep, and talks to a doctor if his fatigue is not getting better because of something more serious.

Autonomic nervous system disorders can have various causes, and a comprehensive assessment is necessary for accurate diagnosis and tailored treatment .DEPRESSION can be a result of chronic illness. Seek medical attention for diagnosis and treatment options. 

Your cervical discs have­ bulged slightly, exerting pre­ssure on the spinal cord area. Howe­ver, it's not severe­. This condition may result in neck, shoulder, or arm discomfort, numbne­ss, or weakness. Aging and spinal strain typically cause such issue­s. To alleviate symptoms, you might nee­d physical therapy, medication, or surgery in e­xtreme cases.

Seems that insomnia and the sensation that your brain is heavy might have appeared after you consumed two 400mg Vitamin E capsules. The reason is that Vitamin E overdose suppresses the nervous system and symptoms like insomnia which may be accompanied by feelings of confusion. Get enough hydration, eat well, and stay away from Vitamin E. 

Headache near eye/ear usually due to sinuses/eye strain. Stress, allergies, infections can trigger.OTC painkillers, rest, hydration can alleviate. In chronic cases, consult doctor. Avoid triggers, maintain healthy lifestyle. 

Altitude sickness can be a serious condition, especially if it leads to seizure like symptoms. These symptoms could be due to altitude sickness, but they could also indicate other medical issues..

I suggest that you see neurologist who will diagnose your symptoms and prescribe suitable treatment. Various causes of memory loss and forgetfulness include stress, anxiety, depression as well as neurological complications.