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!
First of all, he can't keep you out of the house without a court order. You can call a locksmith and get a new key to the house. If you don't file now, any debt that he is charging up is joint debt. File for divorce to protect your assets and to set a time line for debt before the divorce was filed and after.
Right now, he can sell any asset that he wants and you wouldn't be able to do anything about it.
Also, if there is a risk of him damaging the house (the fact that he's breaking things tells me there is), I would move back in(he can't stop you without a court order) and ask the courts for exclusive possession of the house.