help...

Dealing with my 4 month old. 
So after a car ride that existed of bloody  murder crying yesterday, 40 min there and back... then waking up at 3 am and her not going back to sleep until 530.... my nerves are SHOT. Like bad. And her even crying this morning I'm literally almost crying myself because I feel like I can't take it anymore right now. I'm about to drop her off with my mom while I go to work, which will probably consist of another 20 minute drive full of screaming.... what can I do? Do anxiety meds help? I just feel like a bad mom because I just want to yell at her. She's only 4 months old and she's just been so cranky that it's driving me up the wall. Please no judgement.