i was taking 10mg propanolol 3x a day a few months ago but stooped and started atenolol cause my bp went up,but i came off them cause my bp went too low,anyway ive been taking nothing for a few weks now and i get shakes ,heart flutters,and feal weak and dizzy,fast pulse,ive been bad for years but scared too take tablets ,ive had a few few but now too scared to try new ones,anyway i saw my doc today,he checked my bp ,,140/80 not bad and fast pulse but listened to my heart and said it was ok so he started me back on propanolol ,but now he wants me to take 40mg just once a day,,is that ok to take ,im used totaking the 10mg 3 times a day,