How do you cope

How do you mommies cope with not sleeping? Baby since turning 4 months has just been terrible at both day naps and night time. I’m really loosing it, with no one to help it means I’m holding her all day I’ve tried cry it out ddnt work. She used to just fall asleep on her own when I put her down awake and now won’t let me put her down wakes up within 30 - 40 minutes at night usually goes an hour. I really just feel my heart breaking when I feel myself loosing it and wanting to just get in the car and drive away leave everything behind.