My father aged 82 who suffered a heart attack in November 2010 and subsequently had a stent has been on medication since then. But since June 2011 he started with tingling in his feet & now can hardly feel his feet & hands which are numb & cold. He is convinced it is due to the isoprolol even though he is on its lowest dose. He has had various tests done at hopsital including CT, nerve ending tests but they won't listen to him. Can anyone please help. He is getting close to having to give up driving due to this & if this happens this will be fatal as he will lose his independence.