Structural break detected - Now what?

[TheGraduate]

hi there,

i am so very lost that i was short before manipulating my data to eventually finish my diploma thesis. but i just could no do it. the econometricious honor in me just couldn't. however I am totally lost.
i detected a structural break in my data when the crisis hit in 2008m07. i am analysing claim frequency with macroeconomic paramters. my equation is
LOG(HFC) = C(1)*WAS + C(2)*WUS + C(3)*SM + C(4)
,with WAS and WUS as wages in asia and the USA and SM as a stock market index.

now, i know that i have to include dummies. so i added a dummy D01 as 0 for everything before 2008m07 and 1 as after. i set up the equation
LOG(HFC) = C(1)*D01 + C(2)*WAS + C(3)*WUS + C(4)*SM + C(5)*D01*WAS + C(6)*D01*WUS + C(7)*D01*SM + C(8).

I get the error message "near singular matrix". multicollinearity. ok. but what shall i remove?
if anybody has only a hint for me, i'd be very grateful!