Landlord's responsibility on gas leak?

I called my landlord and reported I smelled gas in the hallway from the up-stair's unit and they had someone come and check it out and the person said they did not smell any gas or suspected any gas leaks and it was due to the paint and cleaning of the up-stair's unit. I was still weary so I went to get myself checked out for C02 exposure and my results came back negative although the nurse did do some lab work on me to ensure I was ok and they said I would be fine, and everything was ok although there was indication I was exposed to natural gas, albeit very little and it would not affect me. That same day, I was sent home from work because I was not feeling well, vomiting and all. My landlord had the gas company come out the same morning to check on the gas and the gas company said there was 0% gas detected in the atmosphere, however, the gas had been turned off the same morning so if there was a gas leak prior to that (so throughout the night), the gas company would not be able to tell. Can I expect my landlord to pay for my hospital visit and the money I lost from getting sent home from work or do I not have enough evidence that there was a gas leak and because of the gas leak I had to go to the ER?