I too have inverted t waves. After the initail tests they will bug you after two years then every five for a bruce stess test or something. Mine appeared mid life and i too was superbly fit. Many investigations later and no explaination and no change since . still have a five year check up to kep them happy. Thats just the fact of it they wont leave you alone but i obtained my uk clas one with it and have held an unrestricted one since day one..
If you live up north there is a god cardiologist who is also a pilot who can help. check your private message
farty