@Mixed flock enthusiast, sorry to hear your too isn't feeling well.

How much does he weigh?
This is something I wrote for someone else that had the same thing happen.
"As you insert the tube you should be able to feel it going down on the right side of the birds neck into the crop. Once the tube is inserted you should also be able to feel it in the crop. The tube is correctly placed if you can feel the end of the tube in the crop.
A few things can cause the bird to vomit food.
1. Over filling
2. Filling too fast
3. Tube not down far enough
4. Some sick birds can't hold very much
5. Pressure on crop from towel wrap or handling"