So an update on my issues - 2 sessions of dry needling done.
Tried to walk 500m / run 500m for 2km last week Wednesday. Starting feeling pain in my right foot 300m into the first walk. Tried to run, made 650m in total with both feet very painful.
No running since then (so almost no running at all in 3 and a half weeks)
This morning did a session on the stationary bike, and then tried to do the walk 500m / run 500m thing again.
All good for 2km, no pain. Will try 3km steady running on friday or saturday I think. Still undecided about Olympic distance race in a weeks time.