Okay, so one time I was in the shower and I got really dizzy and was breathing like I had just ran a mile, so I checked my pulse and it was somewhere around 200. i couldn't slow it down and I felt like I was going to pass out. I've also noticed that whenever I'm around any other kind of heat/steam I get really short of breath. I think the heat spikes my heart rate. I can usually slow it down when it's not hot by breathing deep or sitting down but I can't seem to slow it down in heat. Please help me.