Do I understand it correctly that you have to call up your husband's company to have them give you a referral to a psychiatrist, psychologist or some kind of professional counselor for counseling? If so, when you call up to obtain the referral, just lie about the reason why you feel you need counseling and be vague about it as well. Say something like you are having a hard time coming to terms with a past trauma and are experiencing some anxiety or depression because of that. If they don't ask for an explanation, all the better. Keep things as simple and vague as possible. I don't normally advocate lying but since you are calling your husband's employer, although your request shouldn't affect his employment with them, it might. People talk and although mental health care professional are bound by the HIPPA laws of confidentiality, ordinary people at a company who answer the phones and make referrals are not.
Good for you for going to get some counseling. I know it's hard to be in a relationship with someone with a trigger temper. It will definitely help you sort somethings out for yourself but I do hope that your husband obtain some counseling as well since it will help him better understand why he gets mad some quickly and teach him some skills that will help him not be so reactive.
Wishing you all the best.