Ton,
Being told that you have to change the way you live is never an easy thing. It can be difficult to accept what the specialists say when health is the issue; the fear, the worry, the unknown are all elements that influence your mental state. There is absolutely no dishonour in accepting that you won’t be able to do the things you love any more because of a serious health problem.
But…
If you truly love your cycling, and you believe in yourself, and you aren’t someone who tends to give up, then have some faith. Ask around – research those in the field that are regarded as unorthodox, and contact them; you’d be surprised how different a second or third opinion can be from your original practitioner. I know just how ‘out there’ that might sound, but it’s worth a shot, right?
It’s shit now, but it’ll work out. I believe in your desire to make things happen – it might not be a quick fix, but you won’t back down from the challenge.
It’s not in your nature. Good luck fella!