heart pain/ difficulty breathing

Jina
this has started recently and I noticed that this becomes more prevalent when I smoke cigarettes also (once in a while).. I've been on trivora for a year and recently I've been taking it at different times because I keep forgetting (due to exhaustion) 
I can feel my heart beating faster and I am always either very warm or very cold. I'm also developing hives very easily. 
my chest hurts just from wearing bras which are not even that tight... 
do you think this is a blood clot waiting to happen? or am I just stressing myself out for now reason??