Do I have time to drop back to 10mg?

After being on:

12.5mg Friday

15mg Sat

15mg Sun

15mg Mon

15mg Tues

12.5mg Wed

Do I have time to go back down to 10mg? or have I been updosed long enough for this to cause problems?

SAME thing is happening where I felt better the first day or two and am feeling progressively worse.

With the long half life of Valium and the building up of it in my blood, I'm not sure what this would cause; all I know is I continue to feel more sick on this crap and more emotionally unstable.