Please convince i don’t have a brain tumor

I'm a 19f experiencing brain fog, tension headaches, and inability to recall certain words which has started presenting itself in the past six or seven months. Recently, i went on accutane and after about two weeks experienced a seizure like episode in the middle of a nap that i hardly remember but i believe it lasted around 30 secs to a minute. my first thought was intracranial pressure but my headaches are not severe and i have not experienced any vision changes or nausea. i am now convinced i have a brain tumor due to the regular tension headaches i experience alongside cognitive impairments that seem unusual for my age (not to mention i was tested to have an iq of 138). i often feel tired and unable think clearly no matter how much sleep i get. i feel clumsy and imcompetent. i have been diagnosed with adhd and have gone through boughts of depression but this particular issue is unlike what i've experienced in the past. i want to get a ct scan but i'm almost too scared of the outcome.