Nail in the foot and infection. Further.

My father is 67 years of age and has diabetic nephropathy. He is taking his regular medication. Diabetic from last 27 years and kidney ailment from last two years. Now, from last five days he is getting fever on and off and experiencing extreme pain in his foot. Upon checking we noticed a nail in his sleepers which was the cause of pain. His foot was swollen, bluish, red and sore. We consulted the doctor immediately and he was administered some injections for three days. It gave him bit relief from pain and swelling but fever persists. He gets fever and chills at times and then sweats a lot when fever comes down. Today as per doctors advice we got Doppler test and some blood tests done. Not sure what exactly is the situation is but we have been told that their are calcium deposits because of which blood flow isn't proper. Doctor has asked to wait for another two days and then will advice further. Can someone please check the reports and tell whom should we contact further...