I take breaks and drink lots of water when I begin to get that feeling in my head like it’s done. Before the pain starts. So yes that works for me too. I’m 18 months in.
As for the headaches. The whiplash has calmed a lot. The headache pain is less intense and doesn’t last as long. When the headache kicked in, it lasted a few days. Usually 4ish. and sometimes it was more intense. But yes, about 3 months ago it took a leap further away from the intensity.
I do light weights for mood stability. And sometimes I have to lessen the lbs because I feel that headache warning. I do lite arobices too help clear the debris from the electrical storm of the concussion. And I do yoga for peace. (I can’t recall what, but it means or leads to peace of mind).
I don’t sleep on my left side or on my back with my head looking anywhere near left. Or I wake with the concussion headache and the day or 2 is almost non functioning. With pain and fog and concussion.

There is hope! My heart goes out to you.

How’s your digestive system? Mine is wacky. Like right now it’s offline. Well glitching it is. It’s weird. But it’ll get back to work within an hour or two.