I am experiencing low blood pressure and heart palpitations (worsened by: caffeinated drinks (coffee, tea, soda, etc.)) .

It sounds like you: could have a form of autonomic dysfunction. In general increasing the salt intake in your diet and maintaining good hydration is sufficient to resolve the problem. If you remain symptomatic see a specialist like a cardiologist or electrophysiologist for further management. On the internet check sites by Dr. Blair Grubb for further details and management suggestions.