I'll be booking a doctors appointment in the morning, but that'll take over a week to come through, so I thought someone here may be able to help.
If I stretch my calf muscle (with my foot flat on the floor) it causes a bolt of pain in the back of my heel. Not pleasant. If I cycle I feel no pain at all, and walking is fine too. In the morning the back of the heel feels slightly tight.
It's really frustrating to have to take time of the bike, but I don't want to make things worse. I've been cycling 70 miles per week and have slowly increased it to around 90 miles weekly - was feeling good on the bike, so don't really think I have overtrained.