Nervous system, handling unconscious tasks. >> things like blood pressure and heart rate and breathing and digestion, these are functions that we shouldn't have to think about. >> a new study is finding that covid is linked to a five times greater risk of pots. and could be the cause of many long covid symptoms. doctor mitchell miglis, a pots expert at stanford university, says the condition can be crippling. >> the symptoms that are worse when you stand, light-headedness, shortness of breath and physically unable to do most basic activities. >> a standard memory test. >> his pots clinic packe...