Some ideas way out of the usual realm of things .

The new illness, EMS Electro magnetic sensitivity some people cannot be around cell phones smart meters, cell phone towers and wifi. We walked into a verizon where thus a million gadgets going, and had a clerk help us we were there maybe 90 minutes we both walked out felt energy zapped and head aches...i was felling dizzy i think it is not healthy too be in this type of atmosphere for too long.

According, to my Chinese medicine doctor, a cause of dizziness may be food allergies . Get rid of gluten, (gluten is big one for allergies you have to off of it for at least 6 months ) dairy, sugar, soy , corn, nuts and all nightshade vegetables. Are the tea bags bleached that your using? I was told it is best to get on an elimination diet, he told me that scratch test isn't 100% accurate.Also consider a parasite cleanse.

I read of a case where a patient goes to the doctor and the doctor finds nothing wrong and the patient decides to self treat with Natural product for a ear infection and problem disappears.
Doctor are diagnosing correctly four times out of five. So think about that? Unfortunately, we need to do our own homework

Have doctor do a full blood work and get hormones checked.
Check The Air in your house radon, carbon
Monoxide poisoning. Some people get sick from living in
the cities and mold can cause serious dizziness,
Get checked for tmj. Do you clench or grind your teeth get a mouth guard
Look at everything you touch , wear, eat or smell. One of worst thing is scented air and fabric dryer sheets are super toxic. Some memory foam in pillows and bedding have sent people to the emergency room . Even look at the plants in your house or by your window, or your yard.
Take a vacation and see if you feel better, make sure your away from wifi.