ne plus savoir ou donner la tete

Carl, 

it doesn’t have everything of course, but wordrefence is a pretty good starting point for checking expressions. In this case, it comes up positive : 

ne plus savoir où donner de la tête loc v(être débordé)not know where to start v expr  be overwhelmed v aux + v past p

 

https://www.wordreference.com/fren/ne%2520plus%2520savoir%2520o%C3%B9%2520donner%2520de%2520la%2520t%C3%AAte 

Larousse online dictionary is also a great reference for expressions - overall it has more , defined in French, but I couldn’t locate this one there under savoir, donner or tête!