
What Causes Dizziness While Lying Down?

Causes can be many, tests are needed.
Detailed Answer:
I read your question carefully and I understand your concern.
The causes of dizziness can be many, especially in the elderly and often many tests are needed to identify the reason. Actually in a percentage of patients, especially the elderly, even after extensive testing the cause is not found.
It would be useful to give some more info about the history such as:
-how long since the symptoms presented
-sensation experienced (spinning sensation, lightheadedness, general weakness, augmentation when changing position etc).
-evolution in time: persistent, if episodic frequency and duration of the episodes, precipitating factors.
-accompanying symptoms: headache, nausea or vomiting, tinnitus, hearing issues, palpitations, shortness of breath etc
-any other conditions (apart from COPD, emphysema, high blood pressure ) like arthritis, diabetes, neuropathy etc.
-medication being taken apart from meclizine (including medication for other conditions).
-tests she has had, like blood tests, brain imaging, hearing tests.
As I said the causes might be many. The most common ones are related to the inner ear vestibular, followed by brain lesions like a stroke or a tumor, more rarely peripheral neuropathy. Of course blood pressure fluctuations and lack of oxygenation due to her pulmonary issues should be considered. Unless a specific cause which can be corrected is identified treatment consists in drugs like meclizine which she's taking.
If you give me some more info on the questions I asked above about her history and exams, perhaps I could be more helpful.
I remain at your disposal for further questions.

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