Hello and hope you are doing well.
You will need to follow up with your doctor for the schizophrenia and get treated. Sometimes migraines can cause these odd sensations without an actual headache. If you have blurring of vision, nausea and see some light flashes it could most probably be due to a migraine. The other causes could be due to hypertension, cardiac diseases, tumors, aneurysms and some metabolic disorders like hyperthyroidism. Please discuss this with your doctor am sure he will provide further assistance.
Hope this helped and do keep us posted.
Environmental allergies..caused by the aerial spraying, yes India gets a lot, do some research and look up the video 'What on Earth are they Spraying" I get symptoms similar to what you describe...ask for a heavy Metal Toxicity test