What Causes Persistent Dizziness While On Meclizine?
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Detailed Answer:
I read your question carefully and I understand your concern.
Judging by the relation of symptoms with head position change, their episodic nature and the absence of other symptoms which would indicate a brain lesion, I would tend to agree with your physician about the fact that the inner ear is the responsible organ. Perhaps it is not as much related to wax accumulation rather with movement of free crystals inside the labyrinths of the inner ear. It is a condition called benign paroxysmal positional vertigo (BPPV). The labyrinths of the inner ear are very important part of balance and when there is detachments of free particles stimulating the labyrinthine cells it may produce vertigo. It usually improves as the particles settle down, but may recur from time to time.
Meclizine is fine to alleviate the symptoms. When persistent there is also the Epley maneuver, a sequence of head movements aimed in leading the particles to a stable position. It should be performed by a physician though, most commonly an ENT specialist. Not necessary for now in your case as the episodes do not seem to last, saying it more in case they do in the future.
I remain at your disposal for other questions.
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Detailed Answer:
I wonder what the nurses reasons were to tell you that. Did she justify it by your blood pressure measurement, pulse rate or anything else. Did she discuss it with the doctor, what were his findings. There are many nurses who are very good and whose advice I hear even if their opinion is different than mine, I am not infallible nor is your doctor. However I would appreciate it if we discussed things together and reach a conclusion before speaking to the patient, as otherwise patients can be confused by hearing different opinions as it seems to be your case, so whether she's right or not I do not see her behavior as correct.
Anyway, dehydration and low blood pressure can certainly cause dizziness. The reason I didn't include them in my initial answer is your description, your episodes were moving from right to left, or bending down. When symptoms are due to low blood pressure they usually happen when you switch from lying down or sitting to standing (as the added gravity makes it harder for blood to reach up in the brain). Also while hydration is fine and always recommended, if the nurse or the doctor find the blood pressure is too low I would look first at the blood pressure medication you are taking, perhaps dosages should be lowered.
Regarding medications, Mirtazapine and Clonazepam can play a role, they both can cause dizziness as a side effect. However I do not see why it should happen only when changing head position, should be more persistent independently from head position, so I do not think it likely. Lipitor and Vitamin D3 shouldn't play any role.
As for sinus issues, they wouldn't cause dizziness by themselves. If there is sinusitis though it could favor middle ear infections (but it would have other symptoms).
I hope to have been of help.