Generally with an annie there are no signs unless its large n pressing on a nerve or the brain or it has ruptured. Ur best bet is to speak with ur Dr explaining ur headaches and have another scan. Cocaine is a nasty drug that will do u untold amount of damage. Best to steer clear of it. a concussion only lasts a short amount of time and depending on the severity of the consussion, will heal within a few days - week.
At the end of the day u are better to speak with ur Dr about ur concerns.