Really scared..

I've been having anger and crying fits and don't know what's causing me to be on such a mental roller coaster.. anybody know anything about psychology. I haven't googled anything but I wanna know what's causing this not read and guess for myself.. I see a psychiatrist and psychologist this week..

My husband said he's really worried about me.. I've pushed him and reared back like I was gonna hit him and wanted to multiple times... he hasn't done anything wrong but whatever he has done is literally flicking a nerve and I just lose my mind.. break down. I've been suicial lately too... worried my reality I'd gonna fall apart any second. That's how I feel. This makes no sense to either of us because our life is the best it has been in 3 years. Why am I acting out? Why am I so irritable. I don't smoke cigarettes so its never nicotine withdrawals.. I just wake up and I'm fine. Then something strikes and nerve and I just get soooo angry. I tell him to go away or leave me alone and scream or turn to a wall or drop to the floor and cry.. I'm scared for myself... idk what's causing me to be so irrational.

I'm not on any medications. Not taking any drugs