Aitah for getting upset at my parents

Idk i could just be dramatic and selfish and I probably am but i got upset because i wanted to try a new biscuit and they told me I'd have to have multiple and I'd already had a shit day so I said not to worry about it and just had something else ( same cals I just feel less guilty if I eat less it's stupid ik) And they suddenly got Really mad at me and started yelling that I'm gonna end up in hospital and how I'm not helping myself and Making them fat- even though they literally just eat a shit tone at night nothing to do with me and then my mum went on about how she's sick of eating so much too (she doesn't eat breakfast and when she has a snack with me it's a <70 cal cereal bar or an apple) so I felt super guilty and ended up going upstairs. They called me later BC I asked my mum earlier that day if she could help w my French revision. I told her not to worry about it and she asked if I was in a strop and idk I saw red and yelled at her bc I was just so fed up and she told me that I was going to kill my dad bc he was waiting for me to gain weight to go to the gym with him. He had cancer last year and I was terrified that he would get seriously ill so I had a massive panic attack and idk I just feel like shit so yeah