Has anyone had “fainting goat syndrome” post partum?

I am dubbing this fainting goat syndrome. It’s feeling like you’re going to pass out when stressed. I never had this issue before in my life, but it happened at 39 weeks pregnant, and then re-emerged at three months post partum. I’m curious, do any other mommas have/ had this issue?

I’m seeing a doctor this week. I got my blood drawn in Feb, and I have a very low thyroid hormone (THS) which can point to an overactive thyroid. I notice these panic type attacks are happening more frequently.