Hello, I'm 13 weeks pregnant. At home I'm alright, but when I go outsi…

Hello, I'm 13 weeks pregnant. At home I'm alright, but when I go outside (for a walk or to the store) I immediately start sweating (cold sweat), my head spins, my ears feel blocked, and I lose all desire to do anything, I'm weak and barely make it back home. I wanted to ask if anyone else experienced this? And how do you cope with it? (I haven't gone back to work yet — if this continues ?, I don't know what I'll do)