Help docs! i'm trying to find out what causes a foot to feel like you are walking on pebbles in your shoe?

Neuropathy: Is usually the culprit. You need to see a doc to figure out why you have the neuropathy and to find out what can be done, .

Neuroma: Your symptoms sound like a neuroma but an exam and a better history would give the diagnosis.

Pebbles: This description is sometimes used with diabetic neuropathy as well as capsulitis. But you didn't provide any history so that is speculation. See your podiatrist for an evaluation