There are specialist neuro-pschologists that your doctor should refer you to after brain surgery...
It is different. I hope you have a support system and are okay.
I had a tumor removed in 2012 ive never been the same.
i had my sugery 2yrs ago. i went threw the same thing . i still feel that way sometimes. i would get so angery my family was scared to talk to me at times. i still sometimes wish i had died on the table. the pain and feeling different after sugery is so hard to get over. i wished i had died on the table but inside i was happy to be alive. it gets so frustrating trying to be who you was before. you feel like before you had a reson to not be that person. but after sugery you just dont know if you can ever be that person again.i was put on aniexity meds and depression meds it helped . my family called them my happy meds.talk to your sis and support her this is a hard and lonely journey for anyone that has went threw this. this is just my experance and the feelings i had . i hope this helps