My postural orthosatic tachycardia syndrome is acting up. my pulse jumps 50 bpm upon standing and my bp is staying low. is this dangerous or just pots?

Could be POTS: Sounds potentially consistent with pots, a relatively difficult diagnosis which you apparently carry. Make sure there is no simple factor making your symptoms worse--are you drinking enough fluid? Eating enough salt? Avoiding skipping meals? Coming down with a viral illness? If the symptoms are persistently worse and not responding to better fluid and salt intake, you should probably see your pcp.