on about turn 50, i was playing as england and doing just fine. suddenly, in about the space of 4 turns, France, HRE, Venice, Milan, Scotland, Denmark, and Portugal all attacked me

. I am in no shape to take on a 8 front war, and have had to resort to cheating so i can train troops(i dont do so well on defensive sieges

)
is there any way i can stop this without hordes of diplomats or expensive armies? my only allies are Russia, Egypt,(from the crusade to Baghdad, which i won) and The BE, and they are all weak, so i have no support.