What Causes Shortness Of Breath And Discomfort In The Throat?

Hi. I started having these annoyingly scary symptoms, that im not too sure of what/why the reason. I started getting this sort of like thing in the back of my throat, that really sounds & feels like I ve either got something in my throat or as if to clear my throat, but nothing comes out. Usually happens more when I don t get any or enough sleep. Sometimes, if I take allergy meds it helps, but still sometimes not. Also, started to get where there are times when it feels like I can t breathe. Like I can t take a deep enough breathe. Really makes it to where especially when im driving I cannot stand to wear seatbelt or even just wearing Bra has gotten restricting. Sometimes I notice it easier to breathe when air is cooler. What could be wrong?