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This could be a gout attack or a sudden attack of plantar fasciitis
It wouldn't likely be related to your neck issues since it's actually painful to put weight on the foot.
I suggest you have a doctor look at it and see if you need your serum uric acid level checked since gout is cause by a high uric acid level
If it's gout it can be treated with colchicine and indocin followed by allopurinol
Plantar fasciitis is treated with ibuprofen and perhaps a cortisone injection
Let me know if your need any more information please