Dizziness and blurred vision

This morning was very scary. I was walking into work and started to get really hot and light headed. My vision blurred to the point I couldn't see anything and I was about to fall over. I'm so lucky I work in a drs office. They checked my BP which was low - 100/62 - and my blood glucose which was normal - 98. I felt better after a minute of sitting down. I'd been feeling nauseous all night into this morning so I knew it was going to be a bad day. I had a headache and have been nauseous to the point if throwing up multiple times today since then. This is my second pregnancy and with my first this happened a few times but never had problems so I didn't bring it up with my ob. This time I'm working and have a toddler so I can't have this happening. I have an appt tomorrow morning anyways just wondering if anyone's gone through this and if there is anything they can do? I've already suffered from bad morning sickness and am taking meds for that.