Have I got an Achilles tendonitis injury?

Symptoms. It is difficult to know if you have achilles tendon problems without knowing your symptoms, but in general, if you have pain over the achilles, it is wise to see a foot and ankle surgeon.
See a specialist. Depending on your symptoms and any injury history these would help in determining more about this.
Maybe. It depends. Achilles tendon injuries/inflammation are characterized by pain in the back of the ankle/lower leg. Tendonitis is pretty common. Complete tears are usually from trauma and are associated with inability to point down the foot. It also will feel soft where you usually feel the tendon and the muscles may be balled up in the upper part of the calf.