Uy, I can feel how stressed you are, mama, ganyan talaga pag wala lang ang appetite ng baby, parang ang bbeat mo mismo. One of my mum friends had the same thing with her 7-month-old, at ang ginawa namin together was to stay patient lang kasi sometimes it takes a few weeks pa talaga para bumalik ang normal appetite, especially after viral infections or minor tummy issues, did the pedia check for any underlying thing like silent reflux or teething? Since you've already switched formulas and pedia tried vitamins, maybe worth asking your doctor din kung kailangan ng feeding specialist o lactation consultant kung breastfeeding kayo, basta para ma-rule out if there's any feeding-related issue na hindi pa nae-address. Hang in there, hindi ka nag-iisa sa feeling na ito, and the fact na nag-try ka na ng maraming paraan shows you're doing your best for your baby