can anyone tell me about settings.i have a dual lead st jude pm and it is set as low as poss as im sensitive to higher settingsbut i feel as if my heart is being squeezed on each beat. i also feel lightheaded on standing and have fast heart rate after eating and exercise tolerance is poor. i have had the pm for five years and only had these symptoms recently. i have a moveable pm and am waiting surgery for deeper implantation and am due for a pm check up soon but they are not very helpful at the clinic.(im having the surgery at another hospital but this is too far for pm checks) i had my blood pressure checked 140/90 sitting and 145/95 on standing . there is no rate response on the pm. any thoughts would be much appriciated thanks.