Uy, I totally get the worry mo, yan talaga ang scary part ng third pregnancy kasi alam mo na paano dapat mag-feel normally, diba? Honestly, a few of us mums went through the same thing around first trimester, and while scary, babies namin came out perfect, pero please don't skip your OB check, kailangan talaga ninyong makita siya soon kasi the nausea + appetite loss + low energy combo needs to be checked, baka need lang ng adjustment sa vitamins or prescription para ma-ease ang queasiness. In the meantime, try eating small amounts throughout the day instead of full meals, biscuits, yogurt, juice, toast, anything na hindi heavy on the stomach, at if water lang talaga the easiest, that's okayish for now pero hydration matters a lot. One of my mum friends said freezing her vitamins or taking them with food helped her nausea, pero talk to your doctor about this para sure. Reschedule that prenatal ASAP ha, mama, peace of mind mo worth it, and they might have better solutions para feel mo better.