Very low blood pressure and high puls

LilBarbieFeet
Hi future mommies , 
I am 27w now and I am fighting really hard with low blood pressure ( 86/54) and high puls (130) while sitting!! 
Since I got disgusted by coffee in my pregancy Im not really drinking anything with coffein. Now I figured if it gets to bad and I feel to dizzy I drink lil bit coke and this helps me. I can only be in very cool rooms or having air blowing in my face constantly. Standing long , like in a line in a shop makes me dizzy. Sometimes I almost faint laying in bed. 
Im lucky I can work from home but this satus is very depressing and annoying bc I am limited to do anything. 
Does anybody else have same issues? How do you bring your blood pressure up? 

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