What causes swollen ankles and swollen neck at the same time?

Fluid retention caused by excess salt intake can cause swollen ankles and a swollen neck. Usually, a swollen neck is caused by swollen lymph nodes which are caused by an infection of some type but since your ankles are swollen also I would suspect fluid retention. Try severely limiting your intake of salt. Do not just eliminate white table salt. Also eliminate salt from processed meats and snacks.