I felt Botox travel to back of head after my last injections. I want to get Botox again but now I'm nervous. Is this normal?

The injector may have hit a nerve when injecting the Botox. This happens on occasion and has no lasting effects. This could possibly happen again or it may not. Hope this helps. 

It is likely a nerve was touched during your previous injection and it is unlikely that will happen again.  There is no long term complications from this, so that should be reassuring.  Best, Dr. Emer.

Most likely the needle touched a branch of the supratrochlear or supraorbital nerve, or possibly got into a vessel, but no harm comes from this.  It is exceedingly unlikely that it will happen again.All the best to you, Dr. Clark

The sensation you described is possible if a nerve is irritated by the needle during the Botox injection. This is not a permanent issue and should not be of any concern. 

Yes this is normal and can happen.   The pain is caused by being near or actually hitting a nerve which happens.  The surgeon cannot see the nerve but does know the general area.  When injection is done into or near a nerve, pain can travel.  Probably the pain was more likely to the top of your head but wherever it bothered you.   This will cause no lasting issue.  You may have Botox for the next 50 years and never have that happen again.   You will be fine.    My Best,  Dr C

Most likely a nerve was hit during the injection which was referred to another nerve area which innervated the posterior scalp and neck,  then traveled down to the spinal cord to the brain. This occurrence is unlikely to repeat itself.