Hello, I have gone through your query and understood the concern. From your description, it appears as though your dizziness is related to neck movement. If you happen to doing a desk job, especially working on a computer for long hours, neck strain is the most likely reason. Transient hypotension can occur owing to pressure effects during mid and late trimesters of pregnancy. Anemia, increased blood volume during the mid-trimester are other possible causes. Please inform your health care provider and get necessary help. Wish you safe motherhood.