Hello.
Thank you for your query at DoctorSpring.com.

I understand your concern.
The only way household mold or black mold can affect normal healthy individuals is by causing a mild allergic reaction from inhalation of the spores. In asthmatics, it can cause exacerbation of asthma.
Ingestion of moldy food can cause cause a stomach upset with nausea, vomiting or diarrhea.
So exposure to casual amounts of black mold or any other household mold is really nothing serious for otherwise healthy individuals.

Apart from the rhinitis, none of the other symptoms can be attributed to the mold. The small amounts you have found in your water bottle or on the toilet seat will not have hurt your health. So don't worry. You can thoroughly clean up the bottle as well as the toilet seat and continue using them.

As for your symptoms of rhinitis, it is again unlikely to be due to the mold and more likely to be due to an allergen like pollen, dust etc. With the associated sinus issues, you seem to be having rhinosinusitis.
The headaches, vertigo can be due to migraine where the dim vision and feeling faint could be the preceding aura.
For all of these symptoms, it is best to see your GP and get evaluated for a definitive diagnosis and treatment. After a physical examination, a Complete Blood Count may be done as a part of the routine workup.

In summary, nothing to worry about the mold exposure or your symptoms, as with proper management, you will soon find relief.

I hope this was helpful. Feel free to ask queries.

Regards.