What just happened to me? What do I do now? ALMOST FAINTED HELP!?

I was showering and i felt light-headed so i opened the shower door. It felt better, but then my sight became very blurry. Like i could barely see. Then I stumbled out of the bathroom into the family room. The fire alarm went off and I ran into my room and switched my air conditioner on full blast. My hearing turned to buzzing as if i turned on a tv without cable. I regained my sight at that point then my hearing. My grandma turned off the fire alarm and I was fine again. As if nothing happened. I remember everything from the event. I remembered thinking i couldnt move so i should just lay in the bathrrom for someone to pick me up, but then i gained strength and stood up from leaning over the sink. What happened? My mom said when she gets home from work around 9 o clock she'll take me to the hospital. Why did the fire alarm go off? Is there a leak of gas of some sort?! Thanks.