What are the reasons you believe you might need a Certified Divorce Financial Analyst? Is it that you suspect he's hiding or squirreling away marital funds that should be disclosed during a divorce?
Generally family courts have formulas to provide for child support. You could ask for spousal support while the case is ongoing, you may get it or maybe not. A four year marriage would be considered short term and so alimony may not be an issue, generally it is not more than half the length of a marriage and sometimes less. (Mine was 2 months for each year of my 18 year marriage.) A forensic accountant's most common use would be for revealing marital assets when negotiating a settlement, usually near the end of a divorce.
You mentioned that he had moved you out on previous cases. Have you tried filing for 'possession' of the residence during the length of the divorce? He may be the owner but the court can decide who gets possession during the case.
Do get a lawyer to provide you legal advice. If you don't have one yet, at least get multiple consultations — generally free or inexpensive — for legal advice, precautions and practical strategies.
We recommend an excellent handbook for cases like ours with risk of conflict and obstruction...
Splitting: Protecting Yourself While Divorcing Someone with Borderline or Narcissistic Personality Disorder