My dad is alone right now while my mom visits family in the Philippines. My sister and I live across the country from him and none of us have heard from him since yesterday (usually he replies to calls/texts within 5-30 mins). 

Last my mom heard, he's been having headaches and has been sent to get a CT scan in another city. He's been prescribed steroids and he offhandedly mentioned something about a tumor but my mom doesn't know if he was joking or not... 

It's very very unusual for him not to communicate with any of us and I'm very anxious that something bad has happened.