Hi Lolly
The GCSF do cause bone pain with some people,and I suppose they hit the weaker area ,you should gave been warned about them,best to take it at night,then he can have some pain relief and sleep it off.
If you look up GCSFor you should have a leaflet with them,Slim is on Nivestim ,which is a GCSF drug at this moment to help draw white cells out to his blood ,but apart from fatigue and general bone pain he is ok.
Hope you find a leaflet or you can down load one from the net.
The worse side effects are concerning the splean and fever
I think I can remember,they asked when Slim was due his Zometa,so this just might be the problem,I would ring in,they can always get a doctor to ring you. Eve