Q&A: Son’s Night Crying and Vomiting

My 8-month-old son cries and fusses at night and often vomits during the day. After his tonsillitis healed, he has lost his appetite and is only taking formula milk. Two weeks ago, he cried during his afternoon nap, and for the past week, he has been frequently dry heaving, even vomiting multiple times a day. What was the past treatment and its effectiveness? What are the reasons for his night crying and dry heaving, and how should we handle it?
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