Aw, mama, alam ko how scary yan especially first time, that sounds like really bad morning sickness or hyperemesis, and honestly you need to call your OB asap kasi if you're losing weight and weak, dapat i-monitor ng doctor para sa baby mo rin. A few of us had severe nausea in first trimester and one friend actually needed IV fluids, pero once na nalaman ng doctor, na-manage na. Please don't wait lang ha, para ma-ease din ang worry mo, your doctor might suggest small frequent meals, ginger, or even meds na safe for pregnancy.