From what I've read, AE is the really essential component, everything else will lessen the discomfort of the experience and is recommended, but may (may) not be necessary. The usefulness of antacids is debated. An over-the-counter painkiller (acetaminophen, ibuprofen) is easy to get and may be worth taking. Propranolol (or similar beta blockers) will help with the tachycardia that will inevitably come, but I understand it is more difficult to get. Benzodiazepines or other tranquilizers (to be taken with caution, to avoid losing consciousness and vomiting without realizing it) will also help: it also depends on how much anxiety you can handle...