Seeking Experiences with POTS Syndrome: Brain Fog, Vision Issues, and More

Currently being tested for POTS. The doctor is 99% sure I have it. I consistently feel fuzzy in my head and can't seem to think or process anything. Feel like my brain is being squeezed and like I am going to pass out.I Severe sweating, light, and noise sensitivity. Frequent migraines. My vision sometimes is normal and at other times I see black spots that to me look like little gnats flying around in my field of vision. I am not allowed to drive at all. Which is inconvenient considering I am a mail carrier. I have been off work since the end of August. The post office doesn't have restricted duty for rural carriers unless it's a worker's comp claim. I have never heard of this syndrome. I have googled it but would like to hear from people and their experiences with this syndrome. Thank you in advance for any responses and help.