Shin going weird

[Cloud]

Okay so after my chasing dogs and footballing exploits on friday i was pretty worn out, but then i was helping to put up a fence and then went to play footy again
while playing football tho my shin started to really hurt
i hadnt been hit but it felt like id pulled a muscle or something but different
i sprayed some heat stuff for muscle pains on it and it was fine
but then today after yet again chasing dogs around after they got away it started up again. the heat spray thing worked but im sure its not a good thing to come back everytime i run or something
anyone got any ideas what it could be
its the middle of my shin on the inside of my left leg and not near the joints

[Bougainvillea]

This sounds like a minor calf strain, I recommend you lay off it. Or you're more prone to muscle tear.

Healing time, I'd say, will probably be 6-10 days. If it is a strain.