I wouldnt worry @catnuzzle I 'made my mum ill with stress' when I got a cat. They had cats for 40 years, I had my own home, a steady income etc no reason to not get a cat, cant have children, got pet insurance, had an enclosed back garden etc but still the decision was so stressful for her it made her ill 
She was then determined that the cat would spend her entire time shut up in the back porch, never come put to the rest of the house and I would spend limited time with it. The reality is she has pretty much free rein, plenty of cuddles and Im not cruelly confining her to one room (something my mum never actually did with her own cats) whenever I mention the cat being in the living room etc I get reminded that i agreed she would stay in the porch in a disapproving telling off voice, despite the fact I literally never agreed to this. I also get called 'naughty'which does my fucking head in, im in my 30s deciding where my cat goes is not 'naughty'
Any funny stories about said cat (showing her butt to everyone on teams meetings, stealing a ball of my yarn, bringing me her toys) is met with pursed lips and 'well if you will let her have free rein of the house' as if shes creating absolute carnage (to be fair the stealing the ball of yarn one was slighly carnage-y)
I have come to the conclusion she is:
A control freak, her cats were only allowed in certain parts of the house at certain times, me not doing it exactly as she specifies really messes with her control freakishness
A grown up, where as i am clearly still a child incapable of having a pet
Not allowed nice things unless she gives me permission first. She hated it that I told her when I got a cat instead of asking her first. She literally catasrophiesed it like I had wrecked my life and kept reacting like i was a naughty little girl who had gone behind her back. I have to be firm sometimes and point out I am telling her I am doing something not asking her permission.
She then proceeded to have a 3 month relapse of her mysterious illness which has no name or diagnosis but conveniently flares up when needed... because of couse I was such a bad daughter getting a cat and causing so much stress and worry 
So, you know, could be worse... you have my sympathy though the constant negatively and feeling like its a fight just to live your life is just so draining!
(Sorry that was weirdly cathartic, i didnt mean to write so much)