My father (51M) is seriously depressed.

Hello guys! I've been a really long time lurker here but my situation is so urgent I needed to make a post.

My mother (48F) recently graduated from university and got a massive promotion at work in the city council and in result she has been distancing herself from our family to hang out with her friends and her work buddies, including the mayor of my city.. The majority of her female friends are single, which should have been a sign of what's to come.

She'd go out of our house for days and not come back. And that'd happen for multiple months. Eventually, that resulted in my parents' divorce 9 months ago. The divorce went suprisingly well, as they have split EVERYTHING half-half, including custody.

Since then, my mother has had the time of her life, going and drinking on a daily basis, but neglecting her 4 sons (24M, 20M, 18M (me), 13M) as well as her sisters and her sick mother (84F). The problem is, my mother used to make more than my father, and now we have to survive on just my father's income and my grandma's pension (my 2 older brothers do work, but they just recently started and it's only for this summer), and we are somewhat poor.

My little brother has had depression because of this, and my father would take him to see a therapist and he did eventually become better. But the biggest worry is my father. He works 10 hours a day, has no friends- even though he is well-known in the village he works in, he just doesn't like socializing, and our household has few money to spend on food, clothes and other expenses (eg: my braces) and this has taken a serious toll on my family. Additionally, he's not an alcoholic at ALL, but he started secretly daydrinking in silence.

The worst part is that my father is feeling very sad and excluded from society because he's single when most dads his age are living fulfilling lives with their wives. In result of that, he is desperate to find any woman that wants him. He has been talking to this one "woman" on the phone on what's up, but im pretty sure "she's" a nigerian scammer. My father has given her 200 euro before I even found out they've been talking, money we can't afford to lose. "She" talks to him every day for at least 5-6 hours and genuinely seems like a real person behind the screen that helps with his rants and his frustration, and when I told him that "she" is most likely a scammer, he doesn't believe me (or maybe he refuses to believe me) since they have a deep connection.

What should I do? I tried convincing him to go to therapy but he doesn't like that idea (it's very expensive for us), I tried talking to him about "her" but he doesn't wanna hear it. He is a very lovely and nice and fun guy that doesn't deserve any of this. Our situation went from 100-0 really fast. Is there even something I can do? Thanks for reading!

tl;dr: my parents divorced, my mom is having the time of her life, whilst me and my family struggle financially and mentally. Especially my dad, who has no social support except from family, daydrinks even though he doesn't like alcohol, and his only real emotional bond is a scammer pretending to be a girl that wants his money (already sent €200). I feel like therapy is too expensive for us. I'm worried about his mental health and I don't like seeing him like this.