What should i do about the intense pain in the back of my foot? in achilles tendon.

Couple of things.: Ice, elevation and rest. Try otc aleve i would see a doctor to see if it is torn.

Get diagnosed...: This depends on what type of injury you are recovering from. Strains are most responsive to rest and avoidance of stetching of the heel cord. However, there are a number of studies showing that tendinosis (tendinopathy) is best resolved through eccentric stretching exercises. Be evaluated and treated by an orthopaedic foot and ankle surgeon - one in your area can be found at www.Aofas.Org.

Stretch!: Make sure you do your warm-up and cool down stretches consistently. Check your shoes and make sure they are not wore out. Adding an arch support or heel pad may be beneficial. Temporarily hold back on your exercise intensity or duration. If these things do not work, see a podiatrist or orthopedist.