Clairebun

My daughter 19 was diagnosed this week with POTS. Brought on with a sinus infection. BP tested at rest and standing etc. She went to ER and they did lots of tests and she is healthy apart from feeling faint, headaches, chest pain and head tingling. she is day 3 of electrolyte drinks and water. Seen some improvements (she slept last night). how long until we should see benefits of salt? Ive ordered Licorice root - is this ok to take. My plan is to call the doctors and get a referral to see a specialist. What do I need to know / watch out for? Thanks in advance