Good evening,
The nausea that you are experiencing and the bitter taste in your mouth may be due to gastric reflux.
I assume you are diabetic and some of the diabetic medications may cause gastric irritation causing the stomach acid to back up into your throat and mouth.
Gastric reflux can also be caused in general by stomach irritation due to increased stresses in your life and/or the food that you eat. I dont' believe that your blood pressure or your heart has anything to do with the current symptoms.
If I can help further, please let me know.
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Pamela, R.N.

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