I have a sharp pain behind the achilles tendon. the actual tendon does not feel sensative or painful to the touch. pain when pointing ffoot?

Heel pain: Could be either retrocalcaneal bursitis or a symptomatic os trigonum. If nsaids orally or topically, ice, stretching, rest & activity modifications are not effective, then see an orthopedic surgeon or podiatrist for further recommendations.

Sports and Rehab: I agree with dr. Brian t. Chimenti answer, and i'd include seeing a sport medicine or rehab doctor to assess if your activities can be modified. I hope this helps.