This is a concerning situation that needs immediate medical attention. Here's why:
- Severe dehydration is dangerous with one kidney
- Your 2.5L water requirement needs adjustment during illness
- Vomiting/diarrhea for 10+ hours can quickly lead to dehydration

Please:
1. Contact your nephrologist immediately
2. Consider urgent care/ER if you can't keep fluids down
3. Try small sips of clear fluids or ice chips
4. Track your urine output

Don't wait to seek help - with IgAN and one kidney, dehydration can be serious.