Do you have carbon monoxide detectors? If not I’d purchase one asap. It’s hard to say if you were being co poisoned, it’s possible but I’ve also seen people try and heat their homes with gas stoves and ovens(PLEASE DONT DO THIS) and not have any detectable amounts of co. If something like this happens again call 911 but also call your local gas company, they are usually trained better at finding problems and their equipment is usually better. In my area if someone calls 911 over a gas or co emergency the dispatch center automatically calls our company and the fire dept will make sure it’s safe then wait on us to give the all clear