This forum is for questions and support regarding neurology issues such as:
Alzheimer's Disease,
ALS,
Autism, Brain Cancer,
Cerebral Palsy, Chronic Pain,
Epilepsy,
Fibromyalgia, Headaches, MS, Neuralgia, Neuropathy, Parkinson's Disease, RSD, Sleep Disorders,
Stroke, Traumatic Brain Injury
How old is your uncle? He is in need of urgent medical attention. Severe headaches with numbness and loss of vision can be due to migraine or even a stroke.
I would suggest you can try OTC pain killers for headache but other than that he needs to undergo a complete neurological examination. Let me know if you need any more information.