Harry Potter and the Veil of Death

A 40 year old grief-striken and guilt-ridden Harry hurls himself through the veil of death and is thrown into the cupboard under the stairs, aged 10. As his adult memories fade, leaving him with new instincts and feelings, but no concrete knowledge of the wizarding world, will Harry do anything differently, or will he end up making the same mistakes? No super!Harry, no pairings.