Hi all, Since being diagnosed with the following medical conditions I am scared to go out and have a good time with my mates. I am coming onto the age of 18 where they are all starting to drink, smoke (marijuana) etc and I am always nervous that trying anything new will harm me. I always turn down offers for a beer or simply for having never tried it.

The diagnosis was as follows:
Supraventricular Tachycardia
Postural orthostatic tachycardia syndrome
Low blood pressure
Multiple instances of ectopic beats throughout the day

Doctors have been great in giving a diagnosis but not in providing any further information. Is there anything I should be avoiding (everything mentioned + caffine etc), or does this not pose any risk?