worried as usual

so a few weeks ago I started a new job as a hostess at a restaurant. I'm only 20 weeks and an 8 hour shift is kicking my ass. idk what to do I have to work I'm goin to be the sole provider for my child. after a shift the next day I feel awful, can barely move, headache I have 20 more weeks to go. how do women work 10 and 12 hour shifts I feel like my body is giving up on me I have to be strong enough to do this. any encouragement or sucess stories would help