I need serious advice ASAP please 😭

So I’m beyond infuriated I am days away from delivering and for the first time in my life I have fucking lice 😑 to say I’m pissed the fuck off is an understatement, because of my bfs sister and her little nasty friends 😡 I’ve done the lice shampoo and comb 3 days in a row and my bf checked and I’m still infested with lice and eggs!!! Someone plz who has dealt with this give me other ideas that will kill them! I looked up online that my doctor may be able to prescribe something to kill the lice that goes on my head, is this true?! Can someone please help me I am so mad I’m crying and I’m honestly just so fucking mad I could kill someone! This is so unfair I’m already so uncomfortable because I’m full term and then this fuckery happens. To say I’ll never get close to her and her little friends again is an understatement, lice is miserable and I’m so upset 😭