@Covidcovid PoTS can be triggered by a virus and, so yes, Shingles may be the trigger, although it’s a relatively common, but drastically underdiagnosed condition in teenage girls and more common in people with EDS. Some gradually improve and get back to a normal life by early 20s, others - like me, unfortunately are stuck with it, but you do learn to manage it and it does get easier. Personally I have had good, bad (ie bedridden) excellent and ok periods throughout my life. Eating healthily and trying to stay as fit and strong as possible definitely helps.
It’s actually a malfunction of the autonomic nervous system. So although lots of people assume it’s just tachycardia associated with standing and fainting or pre-fainting symptoms, it often involves a lot more. Migraines are very common among PoTS sufferers. The Autonomic Nervous System controls all the things we do without thinking, eg, breathing, heart rate, temperature, sweating, pupil control, gastro and bladder, so there can be all sorts of weird and wonderful symptoms (known as autonomic nonsense in our house!).
Fluid alone won’t help enough, as it’s not for hydration, but for increasing blood volume. She needs salt to help retain the fluids and increase her blood volume. Actually isotonic drinks, like milk, are better than water for hydration and if she will drink them, Nuun Sport hydration or other electrolyte drinks a couple of times a day will help. Compression tights will also help, although they need to be a high compression pressure and aren’t often well tolerated. My son manages knee high compression stockings, which I buy off Amazon - can’t remember the exact compression rating but it’s around 30ish.
Any exercise she can manage lying down (Pilates is good, as is rowing) that will strengthen her core and leg muscles will also help, as it supports the muscle pump pushing blood back up towards the heart and brain. (In PoTS, when you stand, blood pools in the arms, legs and abdomen, so doesn’t get pumped back up to the heart and brain effectively, which is what causes the pre-syncope symptoms and ultimately, fainting, as that’s the body’s way of restoring blood flow to those vital organs.) The brain fog and memory/cognitive issues make sense when you consider the brain isn’t getting enough blood flow.
Reducing carbs and eating several small meals a day instead of large meals is also helpful.
It’s not life-threatening, but it is horrible and difficult to live with, especially in the early days, while you are learning to manage it.
Diagnosing and discharging is unacceptable. She should be be monitored by a cardiologist, preferably an electrophysiologist, who can trial various meds if the non-pharmaceutical options don’t help. There are no licensed medications for it, but cardiologists/consultants can prescribe off label medications. Most people try a couple of different medications and doses before they find something that suits them.
Have a look at the PoTS UK website for more info and advice.
There are lots of different options to try to manage it and it’s trial and error to find out what works for each individual.