Anyone else getting lightheaded, dizzy or fainting?

I have been increasingly since the beginning, starts off feeling like I'm suffocating and hot, then start feeling like I'm spinning and blacking out...usually passes quickly. Friday within 10 minutes i almost fainted twice, but sat down and was fine after a few minutes. Then several hours later it hit again.

Today I walked to work, then was there maybe 45 minutes before I fainted at my register, same symptoms but before i could ask someone to take over. So i got sent home....and punished for leaving early to top it off. Then my bf yelled at me for not taking care of myself, being stubborn and saying that I'm fine...because clearly I'm not.

I know dizziness is normal and all, but it the fainting has me concerned. Can't afford to not work. Anyone else getting this?