I walk a lot my foot started hurtingunder the big toe at the side near the arch of foot when walking, doesn't hurt when touching it also throbs at night?

Foot pain: Do you have a lump at the base of big toe? Could be bunion. If pain under the big toe joint could be sesmoiditis. See podiatrist get x-ray.

Sesamoiditis: It could be sesamoiditis - an irritation of the small bones under the big toe joint. An exam by a podiatrist is indicated.

Big toe: There is a condition known as hallux limitus. That causes first joint arthritis in the foot. When you walk the pressure that translates to the big toe irritates and causes pressure on the nerve passing along that side of the toe. See your podiatrist for an x-ray and diagnosis. Treatment for this condition can vary. Orthotics can help or you may need surgery.