Fatigue

Hi mummies, i just hit my 30 weeks. Lately, I’ve been starting to feel extreme fatigue even when showering and having shortness of breath. Since I still need to go out to work during this CB period( & wear mask at all times), I’m quite worried if my situation will get worse. Anybody is experiencing the same thing? How do you guys cope? Is there something that I can consume to retain energy? Thanks ??