Severe Depression/isolation/anxiety

Back story -

My husband is active duty, we live 24 hours away from our family, we have a 1yr old, 2yr old and I’m 16 weeks with #3.

How do you stay at home, student/work from home moms keep it together when your spouse is out of town? I don’t have any friends, no family, just me to take care of my kids, pregnancy hormones, and no help. I feel like I’m losing it most days. My kids just scream (typical toddlers) and I can’t take it. My 14 month old is super clingy and will literally follow me around screaming when I’m trying to cook/do anything, my 2yr old loses it over the wrong color bowl... and there is NO escape. I take them out to do fun things and they fight, I can’t leave them alone because they’ll probably hurt each other, and there is no escaping the stress and it builds and builds.. I feel trapped... how do you deal with it?