What diseases can cause delusions, seizures, and headaches?

Delusions are: psychotic experiences. Diseases are schizophrenia, mania or deep depression, or delusional disorder. Seizures can be stress or fever induced, but more often are brain disorders (organic). Headaches? Too many diseases or medication side effects to list here.. All three can be induced by drug overdose, particularly the speeds...but hallucinogens can be a factor in delusions and headaches.