The fact that you have been tested for more or less every medical eventuality, means that if anything was wrong, it would have been picked up early and I suppose that you could argue that knowing you've got your health is the most important thing.
Once the CAA Medical Branch get a sniff of something, they get stuck in big time but I (having had an enforced lay up for three months last year), have always found them to be very fair and helpful.
No doubt they'll want to see you before re issuing the certificate, but I'm sure you've nothing to worry about.
All the best.