About to just loose it

Sc

So my 2.5 year old is sick, he hasn't stopped coughing (literally non stop) in over 12 hours. We are trying so hard to keep from getting the illness and especially keep our 6 week old from getting it. None of us slept last night. On top of all of this stress, my mother, who has PTSD and a whole slew of other mental health issues, has been texting me non stop about her parents (who abused her) and her husband who she says verbally abuses her. She constantly yells at him though so its hard to say who started what. Anyway she is always saying she has no one, and no support, and no one stands up for her but I've always been there for her. She has no money, cant hold a job, and threatens suicide. The issue is I really need to focus on my children right now and my own health. How do I deal with this?