my dad is 89 years old and has prostate cancer for 2 years , he is being treated with oxazocine his psa number has gone up to 60, he is feeling dizzy and weak and and is off his food a lot, he does not like eating !for the last 7 months his heart is pausing in between beats , doctors may fit a pacemaker in a few months time , what are his chances of survival , this is his son emailing