African hair.my hair got half relaxed. please help?

i went to this stylist who i think didn't know a relaxer called motions relaxer. i realised it when she had already applied the chemical. it really burnt my scalp and my hair didn't even get well done. i wanted to relax it again after 3wks bcoz it's not fully relaxed and might start breaking but am scared of relaxers right now and i also need a proper way of looking after it well to get body and thick. anti-breakage methods,grow fast too.thank y'all in advance