It's certainly a minefield. I've just had to get a LAPL medical certificate as the class II I went for this month (and passed including ECG) is not valid until I jump through several hoops at great cost because of a recent pacemaker implant which was for bradycardia (slower than normal heartbeat), which I've had for all of my sixty years. It was an hour's job under a local, hardly open heart surgery.
So, I am now fitter than last year when I renewed my class II with no problem and bradycardia. But now I don't have bradycardia I can only get a LAPL medical...I feel like I'm in the middle of a Lewis Carroll novel...
By the way my AME charges £100 for a class II including ECG and £60 for a LAPL.