Hi Welcome to HCM
I have gone thru your query  regarding  low level of potassium . It hapent due to imbalanced food  and less water intake .
Potassium is an important mineral vital for the regular functioning of all of your body's cells, tissues and organs .
An adult needs about 3,500 milligrams a day. Potassium, along with sodium and chloride, helps make electrolytes, which help to form body fluids.
 Eating healthy  for  heart health can actually help and prevent and improve 
high blood pressure save 
heart attack . 
Gulping on only medicines  will not help in getting permanant relief unless you  follow  regular ,disciplined life style and  change food habits from much of carbs  , fast ,fried foods ,tea , coffee ,alcohol ,
smoking   to natural simple nourishing diet full of essential nutrients  and supplements  like  lemon , ginger ,garlic  , 
Aloe vera .
Potatoes and bananas are especially good sources of potassium, which also is found in many meats, milks, fruits, vegetables, and  fiberous  whole grains. ,coco nut water .
 And Regular exercisre 
yoga , deep breathing , proper rest & sound sleep 
Avoid worry , mental 
stress ,anger 
constipation at any cost  ,
All if followed sincerely , regularly  will strengthen your immune syte which gives resistance from diseases fo happy , healthy disease free life 
Hope this helps solve your query 
Take care  All the best
Don't hesitate to come back irf any  further query .