Suggest Therapy For Depression

Okay, where do I start? At the moment, I am having quite extreme periods of depression. 2 years ago, my Mum died very suddenly from a combination of lung cancer and pneumonia and she didn't even smoke. The reason I am mentioning this is because for the first 6 or so months after her death, I didn't cry, I wasn't unhappy, I just carried on like nothing happened. felt so guilty and I still do now. After 6 months my Dad started going out with another woman who he is still with now. This is when I started getting depressed, started self harmony, lost my appetite, etc. I went to see 2 therapists and they don't help. I've recently started to feel very suicidal and I keep thinking of ways to take my own life. But the problem is that I have days of being really hyper and happy, and then it cannot rapidly become the opposite. Another question I have is how often is autism genetic? The reason that I am asking this is because I have a brother on the autism spectrum and it has been suggested that there is a chance of me being on there, too. My Dad has said that my Mum had shown some autistic traits. The problems that I face are real difficulties with socialising, especially starting conversation and I would much rather be on my own all the time and I will avoid going out and mixing with others. I also do not cope with change, I like to have a specific routine, and certain sounds are Mich louder to me than other people. They don't make me completely freak out, but they really, really annoy me. I don't really like being touched unless I am the one who started it, like with a hug for example. I talk about myself a lot, and never really take into consideration other people's thoughts, only mine. I am also not sympathetic or empathetic very much, and I'm not good at putting myself in other people's shoes. I lose concentration a lot, and I don't get back to what I was doing previously much. I really hope that this can be sorted. I'm sorry for babbling on and I hope that this helps. I don't know if this makes any difference, but I am 16 and female. Thankyou so much. Emma xx