Hello, I would be happy to help you with your question.
Assuming that you did not have this problem before pregnancy
, then it is certainly related to being pregnant. It is certainly an uncommon complaint, but in my mind, I would be thinking about:
1. Blood pressure disease
2. Thyroid disease
(this could be rechecked)
3. Blood sugar issues
I would recommend taking your blood pressure and blood sugar DURING one of these spells and also asking your doctor for repeat testing for thyroid disease.
I hope that this helps! Good luck.