I told a friend (when she was doing her usual thing of looking for reassurance) that i cant give her a lot of reassurance cause im trying to stabilise my own mental health

Instead of giving me time and space to stabilise, which is what i need, shes started asking for further reassurances etc

I have to put my own oxygen mask/lifejacket/lifeboat/whatever on first before i can help her again with hers (metaphorically speaking)

Am i being unreasonable?