A married-single mother just letting her thoughts out...

I just dont know who to speak to.. I dont know where to start.. I Feel tired mentally and pyshically. Im a 25 year old mum of a 5 year old boy and 4 year old girl. My husband is with us pyshically but is no help AT ALL. He works 8 hours a day while Im home with the kids. My son goes to pre-school but my daughter is currently at home as we arnt financially stable to put her into nursery. Now just to be clear my kids dont get along. They're constantly fighting, arguing. I've even come to a point where I feel my daughter has ADHD and am currently thinking of getting her checked. No dicipline whatsoever is working, she's violent, very loud and is super hyper. Im currently the only one dealing with the kids; breakfasts, Lunches, Dinners, Attention, Bathtime, Bedtime AND the never ending house chores ofc. My husband is no help.. He'll just sit around watch tv, sleep or go see any of his mates. Now, his cut me off a lot of my friends (Just coz he doesnt like them). If I want to go see a friend (With the kids btw) he always has a reason for me not to go. He does have a weed problem. When his high his really good and he helps around the house at times BUT when he cant find any he gets real aggressive, constantly shouting at the kids I mean we can barely make any noise coz he gets irritated.. I dont know what to do. A part of me says just let it go and tell him to fuck right off. Im fed up of the constant arguements. Then a part of me says stay it'll get better (been together for 9 years married for 6 years, its getting worse). I dont have anywhere to go.. I lost my mum last year, only have my dad, his always a support with the kids and financially other than that I honestly feel so alone to the point I question why Im still living at time.. Sorry for the long ass post, I needed to vent stuff bottled up inside me. If u came this far thank u for ya'll support!