Nancy,

One of the odd things about a concussion is the delay in symptoms. The cascade of damage to brain cells can take days to weeks to fully manifest.

The studies using progesterone as a neuro-protective therapy administer the progesterone for up to eight weeks.

I know that my symptoms change over the first few months after a concussion. The dizziness goes away, the headaches lessen, and the cognitive problems and tremors seem to become more prominent.