Totally freaked me out

So this morning at church,idk what happened but I'll explain. First I started getting really hot and clammy. I thought no I'll be fine just wait it out. Well then i started beading sweat on my face and my chest was completely soaked! I started praying then that God would help and it would all go away (as I'm sitting in the middle pew) well it kept getting worse and then my heart started beating funny and racing and then to top it off my vision got blurry and even blacked out some!!😨 I knew then I had to go out! Luckily I was sitting by MIL and she went out with me. I was shaking and she said my coloring was off! Have any of u experienced this and if so what is it?? I'm the type that always thinks,"oh it's nothing" but maybe I should be worried! I'm 33 wk 1da!