Strained eyes and dizziness

I'm 29 weeks pregnant, and have been very dizzy today, felt my eyes straining and it's been triggering my anxiety, my stomach dips and my heart races... I have history of physical anxiety symptoms.

I don't have low iron levels, or raised or low blood pressure, no protein in my urine or swelling.

I have been drinking alot of water aswell, eating at frequent Intervals, but still when I freak out. My throat starts constricting and my panic rises.

Anyone could ease my mind please. Part of me knows it's part of being pregnant, but my anxiety just takes the better of me. Do any of you experience dizziness too?