Thanks for all these additional details.
I am sorry to hear about your problems.
Well having sudden pain in left arm along with numbness should not be left ignored.
This could occur with myocardial infarction, or heart attack.
Other common possibilities are- Nerve compression, cervical radiculopathy.
Shortness of breath could be part of Pulmonary hypertension or can be indicative of Myocardial infarction.
As you have a history of Pulmonary Hypertension, so this should not be left ignored.
Sometimes stress or anxiety attack could also cause such symptoms.
You need to get urgent EKG along with blood tests to rule out heart disease.
You should definitely get it evaluated before taking flight.
I suggest that you should not delay and rush to ER ASAP.
You should get immediate medical care.
Hope this helped
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