Tonya,
My heart goes out to you as you struggle and even more with WC.
Your fall on the black ice has likely added a whiplash component. Be sure to get an assessment of your neck and specifically your upper neck.
And yes, find a good WC attorney. But, be very careful to find an attorney with expertise with mTBI/concussion. Read up on the pitfalls of WC directed care at
www.tbilaw.com and the sister site
www.subtlebraininjury.com Attorney Gordon Johnson has some good advice to help you avoid getting examined by a biased examiner. The WC docs tend to be hired guns.
Even though they matter to your brain health, do not mention the high school concussions unless asked specifically and only if they were diagnosed by a doctor as concussions. Otherwise, they were just bumps to your head that you keep in your lifetime tally.
Have you tried to catalog possible triggers for your return of symptoms? This will be important knowledge to have as you progress. Remember that a return of symptoms can have a delay after the trigger.
My best to you.