Maybe there is an infection in your foot. When your skin is pierced, bacteria may enter and cause swelling. The symptoms you are having such as feeling sick to your stomach (nausea), throwing up, being unable to have a bowel movement (constipation), headache, and having a high temperature could be due to the infection moving around. Quick treatment with antibiotics and other drugs from a doctor is needed so that you can get well soon. 

Back pain is discomfort in the­ back area. It happens from muscle strain, bad posture­, or lifting heavy objects wrong. To help, re­st, use ice or heat, and ge­ntly stretch. If pain continues, try differe­nt activities to see what he­lps. Ask family to help with chores so you can rest and re­cover.

Avascular necrosis (AVN) is a condition in which the blood supply to the bone is disrupted causing the bone tissue to die. Treatment for AVN depends on the stage of the condition and the location of the affected bone. Its advisable to consult with an orthopedic surgeon for treatment options. The doctor may recommend physical therapy, medication, or surgery depending on the severity of the condition.