I was exposed to carbon monoxide, before i was taken to the hospital it had been 3 hrs. i had headaches, nausea, blurry vision and light headedness. was i supposed to be given oxygen? its 4 weeks later and i still have symptoms i stated above?

I would seek medical attention. I would stress to the provider that you’re still having symptoms. Ask if you can have some oxygen. Also, be insistent that you have a complete evaluation. Make certain that you feel good when you leave treating facility.

Carbon monoxide can result in long-term effects if sufficient exposure has occurred. There may be eventual Parkinson's Disease, but cognitive issues and headaches are not uncommon early on. Would see your physician and investigate the consequences? Neuropsychological testing may be very useful. If you develop a tremor, see a neurologist.