Hello. I think for me the surgery was the less significant factor causing the changes I went through. Aside from the damage from strokes , it's the emotional and psychological experience that played a major role  in change. Overtime (13 years post surgery) having to face your mortality and surviving was very liberating. I feel I have shed many misconceptions causing me to be unhappy. This has had a positive effect in my relationship with my wife and we both are happier and more deeply attentive towards each other.  Hope all goes well for you.
Russ