my partner has rvot his last attack gave him a heart rate of 230 bpm! he is taking bisoprolol fumarate 10mg and hasnt missed any dose he is feeling dizzy unsteady on his feet and cant concentrate he says it feels very similar to an attack but without the chest pain or fast heart rate he looks pale and shakey and feels clammy hes been on these tablets since october last year does the way he feels mean the tablets are doing their job or should i be calling a doctor hes in bed at the moment resting and getting some sleep