My baby does not crawl, sit or stand

Hi! FTM here. I’m worried to my baby ‘coz she can’t crawl, sit or stand. She’s 8 months old btw. Her whole body stiffs and she cries covered with sweat. Her pedia says it might be seizure so we need to undergo an EEG & blood test.I need some advice mommies. Tia. #advicepls #1stimemom #firstbaby