I am glad that you are better. That is a long time to be hospitalized. Because of the severity of your illness and the coma, the dizziness needs to be addressed by your doctor who can do a full neurologic exam on you.
It sounds like you are having vertigo. Benign paroxysmal positional vertigo is a type of vertigo (spinning sensation) that is brought on by changes in position or turning of the head. It can be associated with nausea as well.
It is thought to be due to calcium debris within the inner ear.
Treatment involves exercises that can be done in your home but your physician will have to demonstrate for you how to do them. If the spinning is persistent, there is also a medication that can be prescribed by your physician as well (called antivert)
Other causes of vertigo need to be ruled out (problems in the brain, viral
infections are some of the causes) and these can only be done by your doctor.
I hope that this answers your question for you.
If you have any other questions, let me know and I would be happy to discuss further.