After a lingering cronky leg situation, I had a week of rest from running and did a 5k mixed woodland and street run today. The burning calf came back faintly but I found running on and telling myself it will pass was better than stopping and stretching. Looking like I am on track now for my Race for Life next Sunday. I think it was a combination of stress around my work situation and knocked confidence that allowed the thoughts to control me rather than a real injury as such but feel good now.
Thank you for all your words of wisdom and encouragement. Will just run a couple of 5ks this week in preparation and then once my event is over, back to my 2 X 5 and a long run a week. Need now to slowly build again so I am on track for the HM in September - gulp!