What causes sudden dizziness,hearing loss and nausea?
Not purely vagal response... See a doctor...
The spectrum of symptoms described above definitely suggest transient brain hypoperfusion state. The hypoperfusion caused by straining can be explained by vagal reflex phenomenon. In addition symptoms after bending may also be due to positional vertigo or a cervical spine pathology.
I am glad that you have planned to see a doctor shortly. During the appointment please discuss about the other two possibilities that I mentioned. The doctor will know about the various tests that should be performed to arrive at a diagnosis.
You can wait the 2 weeks to see a doctor. In the meanwhile, I would recommend you avoid strenuous physical activities. Avoid sudden position changes. No bending/lifting activities. If you have history of constipation or cough treat it with appropriate measures.
If you have more of those attacks, it is advisable to prepone the scheduled appointment.
Hope I have answered all your questions. Let me know if you need clarifications.
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