My mom has been having headaches EVERY NIGHT BETWEEN 4-6PM. Every night, without fail. This has been going on for a few weeks now...we increased her Decadron, and yesterday she had her first Avastin/CPT-11 treatment. I don't know where these headaches are coming from, but they are very suspicious... I doubt it's the tumor because it's not like it has a clock that says: "Okay! 5PM I'm gonna act up now!" I'm very scared, and I don't know what to do. Help...ARE HEADACHES ASSOCIATED WITH CHEMO? Even if they are, it's been every freakin' night!!!