northampton wing george north has been advised by leading medics not to play again this season .
brown is determined not to suffer an extended break - so will not rush himself back to action ahead of time .
` it was just after the france game , there was n't one incident where i was dizzy or concussed , but after the game i just did n't feel quite right .
` you do n't want to be into a situation where you 're out for a long time like johnny sexton or geoff parling or something like that