I suspect you may be experiencing anxiety and your heart flip-flopping could be do to anxiety, hehydration and your hypertension. I would suggest you see your Dr. to make sure nothing new has come up with your heart.
If your heart checks out OK then move on to your PCP to see about getting help with your anxiety as well as your diet.
You did not mention if you are on any BP medications as perhaps your skipped beats could be related to medications.
Please let us know how you are doing and keep on talking with us.