Your symptoms sugge­st vitamin deficiencies. Lacking vitamin B12 cause­s tingling hands/feet, digestive­ issues, and headaches. De­ficient vitamin D prompts shaky sleep se­nsations. These deficie­ncies likely cause your symptoms. To fix this, e­at vitamin B12 and D-rich foods. Your doctor may also suggest supplements to re­store levels.

It’s normal to feel lightheaded every once in a while and it’s totally natural to panic. There are a bunch of different reasons why this might happen. Maybe you haven’t eaten much today or haven’t had anything to drink in a few hours. Perhaps you’re working out too hard and getting dehydrated, or you stood up really fast and got dizzy from the blood rush. Some people even feel faint when they’re anxious.

While headaches can have various causes, including migraines, tension headaches, or sinus problems, it's important to rule out any underlying conditions. Consult a neurologist..; they may order additional tests or imaging if needed to determine the cause of your headaches.

Dizzine­ss strikes out of nowhere. Cause­s range from dehydration to blood sugar drops or eve­n ear infections. If hit with dizziness, sit or lie­ down, sip water slowly, and relax. Maybe munch on a snack if low blood sugar's suspe­cted. But persistent dizzine­ss warrants seeing a doctor; dete­rmine the real re­ason. 

Incorporate relaxation techniques and exercises temporarily but seek professional advice for a proper diagnosis and treatment. Avoid self diagnosis and prioritize your health.

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. 

The symptoms of difficulty eating and speaking are the general ones that occur after a brain stroke. It may be attributed to the muscles used for swallowing being weak. Seeing that he mentioned no problem swallowing and eating by himself, you can slowly start to give him food by mouth. Begin with soft, easy-to-swallow foods and keep track of his progress. Do not forget to communicate with his healthcare team along the way.