I am sorry that you are facing this.
It mostly seems like a psychological cause for this nausea
as you are not pregnant and no other cause is apparent from your history.
The shaky camera on TV makes you sick too.
It is possible that it is due to BPPV or Benign Positional Postural Vertigo
. However, I cannot confirm on this without examining you physically.
Please get yourself examined by an ENT specialist
and get treated accordingly.
The fish tank and the algae in it are just increasing the psychological aspect of the nausea.
I wish you get well soon.