Thank you for posting your query.
There are several reasons that could cause problems in your friend:
1. Recurrence of the tumor- some tumors can grow again after surgery, this can be found out with a repeat brain scan.
2. Seizures- brain tumor
and surgery can leave a scar in the brain, which could cause seizures and result in fainting
3. Alcohol related
Please show to a neurologist
Please get back if you require any additional information.
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad,
My personal URL on this website: http://bit.ly/Dr-Sudhir-kumar
My email: firstname.lastname@example.org