Nail Disorder

I had open heart surgery and a pacemaker a little over a year ago all because of Endocarditis. In the last couple of months my two big toenails and my two thumbnails look like a mild case of Terry's Nails that I found on-line. I have showed them to both the cardiologist and the dermatologist. I can't seem to get an answer as to why or what the condition is. I am taking the several medications. Since my recuperation I have been exercising tremendously. Any chance this could be caused by exercise to both fingers and toes? Some of my other fingers and toes have the same condition, but not as bad. My intent is to get closer to an answer. Any thoughts you have are appreciated. I do have pictures available.