Unlike child support, spousal support is often very difficult (if not impossible) to modify after the divorce is final, so getting it right the first time is a must!
Contact an attorney (some will give a 30 minute free consultation) and ask about filing a motion for temporary spousal support. Are there any joint accounts? If so, go and withdraw half of the money in there. You can use that to feed yourself and your animals.
I would also discuss the eviciton notice with the attorney when you consult with him/her.