Hey, Catrin. I have had to reinvent my athletic self several times---the first time, after having been a dancer for about 12 years and then developing fibromyalgia; the second, and more recently, having to quit triathlons because of tendon damage that makes running verboten. I would just say that you WILL find ways through this and around this, and that you will find new athletic doors that you'll be able to walk through. You have my heartfelt sympathy and support in this.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks