How did he treat you before your mum passed away?
How did he treat your mum before she died?
It's not "like gaslighting", it is gaslighting.
And I have a very hard time believing that somebody who was never abusive before was suddenly transformed into the model of an abusive man overnight and simultaneously overnight trained his male child to mimic his abusive behaviour.
More likely, he has always been like this but it was his wife who bore the brunt of it, his son who learned it from him growing up, and now his wife has gone he's made his daughter the new primary target for his abuse.
You don't deserve to be treated like this, you're not overreacting, you're not oversensitive, and you're not being unreasonable.
People who love you don't treat you like this, and they don't kick off at you when you refuse to be mistreated. The threat of them kicking off is frightening you into doing what they want, and that is coercive control. Which is abuse.
Depression and alcohol don't turn people into coercive controllers. But depression and alcohol are used as excuses by coecive controllers for their behaviour. "It's not my fault [I'm abusing you], I was drunk / I'm depressed".
You'd be able to live a lot better without them controlling and hurting you like this all the time. It's not right. I'm sure there's part of you thinking "but he's my dad, he's family, how can I cut him off?" But where is the outraged part of you saying "I'm his daughter, I lost my mum, how dare he treat me like this?"
I know it's usually recommended to people on here for partner relationships, but I really think the information on the Freedom Programme would help you see this behaviour for what it really is and have the confidence and strength to take the steps to protect yourself.
Www.freedomprogramme.co.uk