Can someone help me identify the source of my pains?

I've searched online and have asked many people about these pains i get on my lower legs. It happens when I start playing soccer. My achilles tendons start to tighten up really hard. Usually i step off and try to strech them out but a few times i tried to play through the pain. When i did that, my feet became numb and lost feeling. I had to step off, take of my shoes and strech until my feet regained feeling. I thought maybe my shoes were on too tight so i tried to loosen them, and the next game I experience the same. Can someone try to tell me what i could be experiencing?