Dear friend, welcome to HCM.
how old are you?
it looks like you might be having a torn tendon/ muscle string (tendo achilis rupture.)
if it still hurts and shows a lumpy feel down the calf / dent in the calf muscle bulk, pl. see your doc to check out.
do not stress
that leg. no gym till you check up.
can take simple pain killers like t. acetaminophen
3 times a day till then.
pl. keep me posted.