bmwbzz,
Welcome to NeuroTalk. The studies on progesterone suggest that having elevated progesterone levels creates a neuro-protective effect. Unfortunately, the primary researcher is trying to protect the data and patent the process so the drug manufacturer can make money.
Google "Progesterone" and "TBI." You will get a good start with the results.
It sounds like you also have a neck injury. These are common with concussions.
Unfortunately, hormone testing is not cheap and the cycling you are going through will be hard/expensive to chart by hormone levels. A specialist in bio-identical hormones may have a better understanding of your condition. You can get a referral to a bio-identical hormone specialist at
https://www.womensinternational.com/..._referral.html.
My best to you.