Minimac,

You said, "What I'm meaning to ask, is if it's the CSF that can sustain 60 G's, or the brain itself when/if the CSF fails? If the CSF fails to cushion all of the force is there still a remaining 60 G's of force which the brain can tolerate without any cushioning protection? And also, does the skull and skin absorb force before it reaches the CSF? "

These questions can not be answered. There is not enough information. The key piece of information needed is the distortion of the skull. We would have to make a number of assumptions to do the calculations. If we use 1 mm of CSF as a cushioning distortion and another 1 mm of skin distortion and 1 mm of skull distortion and 1 mm of wall distortion ( total of 4 mm cushioning distortion), then a 5 cm drop at normal gravitational rates would cause .05/.004 G's or 12.5 G's. But, the 60 G's of force considered the threshold for the brain is measured at the surface of the skull, not at the brain. So, we need to leave the 1 mm of CSF out of the calculation, so .05/.003 is 16.6 G's.

I do not believe these calculations will help you with your anxieties. Every bump will be different. Every time your head contacts an object, you will need to assume a new set of factors.

You need to accept that life happens meaning minor bumps happen. The brain is tolerant of these minor bumps. You need to constantly remind yourself that "Bumps happen and the brain can tolerate them. " Trying to understand the science will not help nearly as much as changing the way you think.