Mental health. Crazy now what shld i do!

I have been experiencing bouts of mood swings , don't feel like interacting with anyone , am married for 10 yrs and is a mother of 6 yr old kid. My husband use to work at a very good position with a well known business house, he impulsively left his job to pursue his passion of business, things didn't work out his way, it's been 4 yrs and still he is not settled , he has always been a very carefree person , I got busy with my son and my ailing mother for whom I had to travel often to my home town, as the time passes my husband's involvement in my and kids life almost became nil, he got busy in his own life, drinking daily , financial issues led to more problems in our marriage he started raising hands and once daily badly, I left him and came to live with my father my mother passed away last sept, now my husband is def no ok with that and keeps threatening us that he will kill himself, he said he got some medicine which will induce him to kill himself. Am going crazy now what shld I do