Sounds like you were getting a bit into overtraining. And then, this is probably the most important sentence you wrote: “Since then I have never stopped completely…” Most of the time it’s better to stop early and give your body some time to rest. Especially if you were not able to run the race.
My advice would be to stop running now for a bit. And do the strengthening that the physiotherapist recommended.
Then start slowly with running again. But only when you are pain-free and you don’t feel anything while running!
Do you feel any pain while cycling? You could do that as an alternative endurance training.
BUT focus on getting healthy!!! Then you can get back into shape!
By the way: What does your coach recommend?;-)
get well soon and
stay relaxed in the meantime;-)