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Dear Cathy:
What it sounds like is that your have a small pharynx, the back portion of your mouth/throat. But, I would let your physician verify the observation. If that is the case then you may need surgery to make that opening larger. You shouldn't have any major effects on your swallowing or ability to speak. But don't think that surgery is the only option. Depending on what the sleep study shows, a trial of CPAP may be the solution. The balance issue was only during emotional times and connected with daytime sleepiness and early onset REM the diagnosis of narcolepsy might be entertained. If you have balance problems all the time then this diagnosis would be less of a probability.
I hope this helps.
Sincerely,
CCF Neuro[P] MD