Yes definitely. I am very sensitive to anything like that which jolts or vibrates my head. I avoid them and it sounds like you should too. After 11 months I have still not run for this reason.

If you can't avoid a car journey over bumpy roads or speedbumps, a lot less of the vibration goes to your head if you lean forward out of the seat. I guess your body takes more of it rather than it travelling up the seat straight to your head, or something.

A word of warning, this 'fragile' head meant that when I was well on the way to recovery and was jolted hard in the back by an overexcited teenager, the effect was basically the same as another concussion, even though he didn't touch my head. I would estimate that this incident added about 8 months to my recovery. Be very careful to keep yourself out of harm's way.

All the best!