kw,

Welcome to NeuroTalk. You are making a common assumption. Just because your head did not strike the stairs as you went down does not mean your brain did not suffer trauma. The shaking alone can cause a concussion. The trauma to your neck can resonate to your brain. The neck trauma can cause inflammation that can interrupt blood flow your your brain.

I highly suspect you have suffered some level of brain trauma.

The week delayed onset of neurological symptoms is common to concussions. It is a result of the brain finally giving up the fight to save injured brain cells and connections.

A clear MRI means nothing regarding a concussion. Concussions are not imageable except with very high power imaging systems.

Read the sticky at the top of the forum about Vitamins and Supplements. It has some good links at the bottom.

Keep us posted.

My best to you