You might have something we call a vasovagal syncope. Some of your blood flow may change for a short time when you sneeze this is what causes the feeling of faintness and may interfere with your ability to move your hands and legs for a while. Try sitting down or lying if you feel like sneezing. Also, make sure to drink enough water and have sufficient rest always. If it happens frequently or becomes more severe, see a doctor.

As per the complaints, this is a case of Sinusitis.

If you have sinusitis, the doctor may be able to recommend additional medications to relieve your symptoms, such as steroid nasal sprays or drops to reduce sinus swelling.

antihistamines - if your symptoms are caused by an allergy

Antibiotics - if you have a bacterial infection and are severely sick or at risk of consequences, antibiotics may be prescribed (but antibiotics are often not needed, as sinusitis is usually caused by a virus)

Symptoms such as fever, headache, throwing up, diarrhea, and nervousness could point towards a stomach bug or food poisoning. These might also leave you feeling light-headed or generally unwell. Make sure to drink enough water, get plenty of rest, and stick with bland foods if this is what you’re going through. If your condition doesn’t improve or gets worse than before, please see a doctor so they can examine you properly and give appropriate treatment options. 

It may sound like you have a condition known as sinusitis. Sinuses get inflamed when spaces around the nose are filled with too much mucus due to colds, flu, allergies, or other conditions. This can lead to pain in your head especially when you lean forward or cough/sneeze; it also causes swelling in the eyes, nausea, and vomiting. To feel better try using warm packs on your face and take pain relievers that can be bought over the counter. Keep yourself well hydrated and rest enough too. In case these signs don't go away, you should see a doctor who will check them out further and treat them accordingly. 

I understand your niece­ faces brain meningioma and a tumor in her right e­ye nerve – se­rious conditions, yet treatable. Me­ningioma often brings headaches, vision trouble­s, and weakness. Eye glioma risks vision loss. Tre­atment options: surgery, radiation therapy, me­dication. The key is working closely with specialists to choose­ the best care path for your niece­.

The re­d skin, tingling, pain, and nerve issues could be­ from too many bad molecules in your body. These­ bad molecules can hurt cells. To he­lp stop the bad molecules, e­at more fruits and veggies. Also, talk to your doctor about helper pills that may stop the­se issues from the bad mole­cules.