What could be wrong with my dog?

my dog is 14 years old (had him sinces I was 3 months old) he is a becian fres (something like that) and I know his time should be coming soon so I have been preparing myself but he has been acting strangly for the past month..

first he devloped a sort of large bump on the back right part of his head.. and he has been jumping a lot

what I mean by jumping is if me and him are sitting on the couch and after like 10min his body jerks upwards when he is asleep..

sometimes he jumps so bad he falls when he is walking or he jumps of the bed while he is sleeping im very scard of whats happening I have bee up all night for the past 7 days cuase of how bad he was jumping..

we are going to the vet on the 31st but is their any thing that you could suggestion or comment on the situation im in..?

sorry for the misspelling I did not recheck my typing

Here's some info:

http://en.wikipedia.org/wiki/Bichon_Fris%C3%A9

Good luck !!

I think he might have a tumor.
My rat and dog had them. =/

Could be one of many forms of cancer, or a tumor, and if so, the jumping spurts could be mini-seizures.