I'm almost half way through a similar program, also full time and with fulltime work between two jobs, although I don't have the family aspect to manage as well.
I can't pretend I've been handling this semester particularly well because of an accumulation of stressers over the past 8 or so months, but from what I've seen that's also sort of expected. Grad school is tough, and mental health programs with the practicum/internship stress and all the personal growth that will happen as you go through are in some ways even tougher. And then on top of that, life happens and often chooses just the worst time to happen. Like as soon as you start school.
My main advice is talk to your professors. They're there to help and they all work in the field. There's still stigma, sure, but most professionals I've interacted with are really on board with the "we're only human and if we weren't already a bit messed up we probably wouldn't have had any reason to end up in this type of program" mentality and you'll have at least a few who really care so much about their students and just want to help you succeed. Also don't underestimate how much support you can get from your classmates, who are also going to be scared and stressed out and feel completely ineffective at times. It's also pretty common for other people to be struggling with their own mental health concerns, adjusting meds, or going through crisis and if your cohort is open with each other there's amazing chances for connection and support there. Study parties and being really clear about when I needed to hang out just to have people around who wouldn't ask annoying questions has saved me this semester. Sometimes just a quick "do you have any clue what's going on in this class?" text and getting back either "no, I don't think anyone does" or "sort of- want my notes?" can be super normalizing and really help.
Also, find good supervision when you get to internship. The type of site doesn't matter as much as supervision- you need someone you can be really open with about your struggles with your own mental health so that they can keep an eye on it and if you have a bad day you don't have to hide it. I'd highly advise getting rapport with a therapist for you before starting a program too, if you don't already have that. Because parts of the coursework are likely to turn your head (sometimes the things you really don't expect to be an issue) and the stress of grad school is enough to push anyone to the edge, existing concerns or not.
Just my experience/observations honestly but I hope some of it's helpful. Feel free to pm me too.