What Causes Pain And Pressure On Back Of Head?

hello i really would like to talk to someone about the neurological problems i have been having, the symptems change alot and im really scared of going to the doctor so i dont get in much. right now the back of my head on both sides is hurting so bad it feels like a preasure and gets much worse when i cry laugh bend over or anything like that. sence this has all started about 2 years ago the first time i got bells palsy, it has been happining but from time to time it gets real bad like this ... any info on what is wrong with me would be great!