Hello...not every body have same response to same drug that is why your friend was not able to understand your problem
To start with cannabis cause tachycardia
....means increase in heart rate
Secondly it cause dryness of mouth and make people feel thirst and an experience of chocking in some.
Third cannabis smoking
precipitate panic attack
in some patient ...and you may be one of that.
So you need not to worry so much ...all you have to do is.....remain away from marijuana ....don't try it repeatedly.....observe yourself on longterm ,,,,and if you do not reexperience these symptoms than no intervention is needed. If these symptoms develops even without use of cannabis now ,,,you may need medical treatment by a psychiatrist