Rest from aggravating activities is good.
The exercises shoul not increase pain if they do perform on 2 leg rather that 1.
Seems you have done a lot of resting an then gone back to heavy exercise and back to pain.
You need to condition your calf muscles with stretching and strengthening like i talked about but they should not increase your pain. You should just feel the muscle working and some fatigue.
Swimming should be ok at the moment but nothing that increases pain. we need to settle the pain and strengthen in a non painful manor.