The thing with greenish/brownish color is a vaginal discharge
that should attract your doctor's attention as it might refer to vaginal infection
and should be treated correctly with antibiotics (orally and locally).
Can you measure the blood pressure and blood sugar at the time when you are feeling hot, shaky and nausous and report the results to your doctor?
It is good to discuss with your OG if what you are experiencing might be related to infection or blood pressure or diabetes?
Do not worry. All these problems can be properly treated, but need an immediate consultation with your OG.