31 weeks pregnant and I almost fainted

Last night I having cookies with milk in the kitchen going thru my phone suddenly I started feeling sweaty cold and like if my blood was going to my face I got up started walking to my room everything got blurry hubby was sleeping I barley had the energy to even call him for help I was babe!!! He came right away to help me and lay me in bed a few minutes after it went away and I started crying just got really scared it was a really bad feeling I was afraid to passout and fall on my belly that's my worst fear to fall or trip on my belly been feeling kinda weak since then I have an apointment tomorrow morning thank god and I will let my doctor know, has anyone felt this what could've be?