severe sciatic nerve pain

i’m at the point where i’m crying and cannot walk. my mom has been helping me with my other two kids and i’m calling out of work constantly. my job is pretty understanding as i’m in third trimester. i’ve never been the weight that I am now like i’ve never seen it on the scale. my last two pregnancies Iost weight and just gained it back. this pregnancy I never lost weight in the beginning and i’m just steady gaining. i’m also a little bigger than I was with my other two babies. my doctor today refused to put me on a medical leave and I took it as she thought I was lying.. she put someone else I know on a medical leave for the exact reason but told me she has no authority to do so.. unless they have changed rules. so she referred me to a specialist to let them determine if I need a medical leave or not. I find it pretty ridiculous that I told her I cannot work, or take care of myself like I need to because it’s severe. I cannot put my leg down a lot of times because the pain is unbearable if I step I will most definitely fall. i’m not trying to take off of work just because this is a real reason. she told me bc i’m not taking tylenol every 6 hours that i’m not trying everything I can. I bought a belly brace, i’ve been using a heating pad and it’s just not working. I do not want to take tylenol often as it has a lawsuit for autism is kids (my preference) and she can’t make me take it either. anyone else had bad sciatic pain? the farther along I get the worst it gets..I am 29 weeks