Hi...
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns...
As per your complain the white coating over the back of your tongue seems to be due to
fungal infection known as
Oral Thrush and it might be due to intake of Flonase which is a steroid spray and steroids can cause oral thrush and for thrush anti-fungal mouthwash like Nystatin mouthwash,
clotrimazole lozenges can help along with taking ample or probiotics like Yoghurt and garlic..
Other part of your question is
dizziness and vertigo and itseems to be related to
inner ear infection and antibiotics may be needed for it..
As you have wisdom teeth erupting and if they are erupting properly and not causing any discomfort like swollen gum flap around it then you need not to worry as these symptoms are related to ear infection and not wisdom tooth..
Consult your treating physician and get evaluated and for dry and white tongue he can advise you anti-fungal medicines as I explained above..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.