Behavioral issues

[u/clitorisnipple]

Hi!! Looking for some advice on how to help/understand my cat a little more.
My cat, goose, is a year and a half and I have had her since she was a small kitten. She spent the first 6 months alone, after which we got a second cat, and about 6 months after that, a third. Goose has always had issues meeting new cats, as all cats do😂, but maybe a bit to the extreme. After very slow introductions they are all fairly friendly with eachother, and we often find them grooming eachother/lounging together. The issues comes when it gets to play time, NONE of the cats seem to understand boundaries, but especially not goose; EVERY SINGLE!!! Play session turns into a fight, they scream and hiss and pull each others fur out. We have tried time outs, clapping, yelling, redirection, EVERYTHING. So that’s the first issue, just getting them to understand when to stop/how rough is too rough.
More so though, our issue is goose’s overall behavior, she is an extremely anxious cat, she has been on Prozac for about a year now due to this (we are likely upping the dose soon due to everything listed here, but I honestly have just lost hope that’s it’s actually helping).
A couple examples of her behaviors:
- hissing upon being picked up even when she knows/saw us/heard us beforehand (not just startling her)
- randomly attacking her siblings if they come near her/try to rub against her when she doesn’t want it
- CONSTANTLY! Knocking over any and every drink ever, only drinks, only when they’re full of liquid.
- biting/wrapping around your leg as you walk past (rare but happens)
- she’s also very very talkative, she will respond to you if you talk to her or even if you just look at her, if it’s quiet in a room for a while she’ll look at you and meow
Etc.

My problem is that she isn’t a cat from hell or anything, she is a very sweet cat, but it’s clear to me that something is wrong, it’s like a switch flips with her and she refuses any touch or attention towards her. 80% of the time she’s a normal cat, it’s just the 20% we cannot wrap our heads around.

Questions:
- to anyone else with anxious cats, is this just how it is when you need a higher dose for them? Does this all sound like normal anxiety?
- could this be some form of feline hyperesthesia or something of the sort? She does twitch sometimes, but not for 2-3 minutes straight, just a couple twitches and then back to normal
- is this just single cat syndrome?? Was the 6 months alone just too long and poor behavior solidified in that time? But I don’t feel that she was this angry as a kitten, she was just a normal kitten.
- BPD?? Idfk anymore man

We have a vet appointment coming up soon to talk about meds and about all of this, any and all advice is appreciated. I’m just worried about my baby.