Stressed new mom

Hi ladies, just a quick vent. I’m a new mom of a beautiful 3 month old baby boy. I never knew how much work a baby was truly. I new it was hard but it’s becoming harder. He has stomach issues and some days will cry for hours. I feel like a terrible mother not being able to help my baby during these fits. He’s also on alimentum which is crazy pricey, but works for him. Insurance won’t cover it, so it’s been harder financially. I feel really isolated, and extremely lonely. My husband works from 5am to 8pm and by that point I’m exhausted. I feel like I’m literally failing as a mother and wife.. ugh. Do things get easier?