dear doctor, I am 62, operated for lumbar discetomy at l-4,l-5,s1 in 2009-Jan.I was bed lying upto April-2009 then I could walk, seat on chair and did table office work. Even now as on to day I am facing errection dysfunction, and no intercourse since Dec-2008 and the reasons are not known to me.kindly guide me with medicines and other remedies, as far as possible. Thanks.