What Causes Swelling Around The Ankles With Discoloration?

After a day on jury duty that required 15 minutes of standing and sitting from 8:00am until 5:30,pm my feet begin to swell on the medial side of the ankle and on top, with darkening of the skin; my lower right back hurts (possibly disc issue) the upper center of my back hurts making breathing painful; my upper arms hurt so much I can barely reach my hand to my head; and I have a low grade temperature (99.9). This has been constant for two weeks and counting. Any ideas? I have a history of essential thrombocythemia, degenerative disc disease, hypertension, high cholesterol and had major surgery 10/15 (cholectomy, adhesion lysis and gall bladder removal)