Bruise on inside knee bend gets darker/constant severe pain/tripped twice wearing heels/landed hard on bare toe tips/toes ok/knee not ok/back of knee and top of calf sore. Pain making me cry.

Gastrocnemius . The origin of the gastrocnemius complex is off the distal femur eg. Behind your knee, and you may have traumatized the origin of the muscle either torn it partially due to the presence of bruising or partially avulsed it due to the mechanism of injury i would pay a visit to your primary to check.
Need the area examin. You need to see your family md to establish if there id=s an injury and its extent.