I already answered the questions.
I was vegan once, when I was younger. I was a passionate vegetarian for years, then going vegan seemed the logical next step. And I loved it for years, until I got very, very sick.
I was hospitalized 10 times in 3 years, malnourished, and twice on deaths door. Not because of Veganism, but because of Ulcerative Colitis and lung embolisms caused by the UC.
My bowels were damaged so badly that my colon is permanently removed.
And now I am no longer vegan, because since that surgery getting enough b12 and vit D eating leafy greens and beans is challenging and not possible without supplements. The nutrients from vegan food don't get digested well by my shorter bowels and the doctor recommended to eat animal products to compensate for it.
I did, and it got my b12 and vit D levels back to normal. I felt a lot better. I still don't consume all animal products, I insist that they are organic and humanely raised.
But I often hear vegans say there is never a reason why someone cant be vegan and that's simply not true. There are people like me out there.