Thanks for all these additional details.
I am sorry to hear about your problems.
Well, considering your symptoms possible cause can be-
traumatic or inflammatory and not something of cardiac origin. It is not related with heart disease and not related with any serious issue.
It can occur with muscle pull or nerve compression.
You should continue with painkiller, and avoid any stretching.
You can take OTC Advil.
Muscle relaxants, are also very helpful in such cases.
No need to worry.
From my clinical experience i am sure, this is not related with any serious issue.
Yes, you can safely go for vacations. No need to panic.
Wish you a happy vacations.
Hope this helped
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