Cat
I realize that I'm a lot so please tell me to back off if you need more space to kind of absorb all of this stuff.
But that said, I thought a lot about all of this last night and I have a million questions about the how your immortality works on a day-to-day basis because if you ARE throwing up everything you intake (presumably that's water too), then it's not a reactive immortality but possibly a sort of continuous one that acts to maintain your cells. If it's a reactive immortality - it's just death that triggers your power - then aging would seem uncompromised. But if it's a continuous immortality, then it's more likely that your cells wouldn't age because you wouldn't have cellular degradation.