So I got my baby 1 week ago exactly, and at first, everything was fine. Poops were normal, eating habits were normal, energy was normal. And then 5 days ago (Monday), he stopped pooping anything but very liquid black poop, and there was blood in it and he only pooped about once every two hours and it was very little. Then I noticed he had stopped eating. On Wednesday I took him to the vet and on the way there he started throwing up white foamy stuff with a little blood in it. They gave me antibiotics, probiotics, and an ulcer medication, but the results they had gotten from all of their tests were clear. When I gave him his antibiotic the next morning he threw it up immediately and so the vet told me to bring him in for X-rays. He was there all day and they found nothing in his X-ray and he's not anemic. He had lost 4 ounces since the previous night so they gave him a shot of a new antibiotic and some fluids. The nurse said she also got him to eat a little chicken baby food and hold it down while he was there. Since then, I've been feeding him a few licks of chicken baby food with Creature Comfort and water in it every few hours. And he only keeps it down every other time he's fed. He's kept down his medicine, so thats good, but his poop is still the same color and he keeps throwing up every other time he eats even the tiniest bit. (the blood in both is gone now). His energy comes and goes but he's still mostly active.