Hello and welcome to this site. Sending you a welcome and, it seems, a much needed welcome hug.
I am so sorry to hear that you have been going through so much and have now lost your mum too. Clearly you were very close and this will have hit you very hard.
Losing your mum is one of the worst things that will ever happen to you, especially if your home life presents challenges also and I am not at all surprised to hear that you are struggling. Also, your loss is still very recent and recovering from such a close loss is always going to be hard, but there are lots of people here and on the Facebook page who will be going through the same thing and will understand how you feel. I am one of them. I lost my mum just over two years ago now, so am a little further into this journey than you. It is a difficult process and takes a long time to improve, but it does get better, very slowly. I am sure you will get some very good advice from our lovely members. All I can advise is that you have to be patient as it doesn't improve quickly. You will have good and bad days, but taking it one day at a time is all you can do.
Be kind to yourself. Try to remember to eat and drink properly, If it helps, perhaps try counselling. Your doctor can refer you for grief counselling. There are also grief support groups in some areas, so perhaps explore that option and see if you have one nearby that you could join. It sounds as if you could do with finding some new friends, as your home life sounds as if it has its own stresses for you.
I have found that grief is something that you have to try to help yourself to recover from and for me that meant little comforts like having flowers around and taking walks in the park where I could sit to try to think about all that had happened and absorb and come to terms with it all. It also helped me to write down how I felt and what I thought about all that had happened. Writing it down did seem to help me get some of it out of my system.
In terms of losing your mum, I have found that loss changed me as a person as well as changing my life and the way I feel about life. It rocks your world and collapses the foundations of your everyday routines, so it is not surprising that it has such a massive impact on you. It is not however, sadly, reversible, so you have to find a way to live with it and accept it. You do slowly find a way forward, but it does take time and perseverance and being kind to yourself. One day at a time is all you can do.
All best wishes to you.