Hey,
Your symptoms show that you are suffering from tendon pain; maybe there is a chance of Achilles or Plantar fasciitis. Both are having severe pain in the calf muscles leading to the foot. We can't avoid the opportunity of tibialis tendinitis if your ankle is swelling or redness and felt too much pain when standing for a long time. I know a similar case like you, one of my friend's moms were dealt with. Now she is okay, and I think she did therapy like radial shockwave treatment or something. She is better now if you want to know about it I will ask her and inform you. Anyway, don't take it as silly consult with your doctor asap.