Hola
@mem, when we age (I'm 75) some things start to break down. Now that you have a reasonable diagnosis of the problem the decision is yours. As one who has had some bursitis rest and pain killers are the only solution. Yes it will be a little sad to return home with your camino uncompleted.
If this is likely to be your only opportunity to walk the camino and arriving in Santiago is important then "maybe" busing to Sarria might work as would transporting your back pack. From memory its reasonably easy to make the last 100 km (60 miles) into 10km stages. Best wishes.
That's a fair point. And a big "maybe".
If this is your one and only 'shot' at a Camino.
On my first Camino I had similar injuries and was down to 10 km per day by the time I reached Sarria.
There are good Fisios along the route. I recall a great one on the main street in Arzua.
Obviously our situations are all different.
But I made sure to see a Fisio every few days.
I got them to massage and strap my feet/tendons.
Show me how to DIY restrap.
I used RICE. Rest, Icing, Compression, Elevation.
Good use of poles........every step.
I actually had the problem pre Camino, but was determined to go.
So I took medical advice regarding pain killers, anti inflammatories etc.
I needed those all the way from St Jean.
Which was probably not a good thing to do! (even with my Doctor's advice)
But those last 100 kms were particularly painful, the condition just got worse day by day.
And I suspect I may have created a longer term problem.
So please be careful and sensible.
But obviously, I wouldn't recommend taking medical advice from non medical professionals who don't know your specific condition. I only share this to provide a few thoughts on things that have helped others.
Above all else........heed the advice of the medical professionals that have examined you!
They treat Pilgrims like us on a daily basis........