I highly recommend you to check out this website SOMATIC TRAUMA THERAPY It has many good videos explaining trauma and ways of dealing with it in very simple, down-to-earth language. The book "The Body Remembers" by Barbara Rothschild featured on the website is a very good resource on how to cope with traumatic symptoms on a daily basis. I believe, the principles that are outlined there could be applied to any level of trauma.

I wouldn't recommend to set up such a huge goal for yourself as to develop your ability to form attachments. Not at this time. At the moment I would recommend to set up a smaller and more realistic goal of learning how to adequately manage your symptoms on a daily basis through practicing methods suggested in the sources that were recommended to you and the ones you find on your own. Feel yourself completely free to experiment and to find what works for you and what doesn't through experimentation. Don't follow any method blindly. If something doesn't work for you, discard it and move on to something else. Most importantly, take a lighthearted approach to any personal work you are doing. Look at it as an interesting adventure of getting to know yourself and have fun with it as much as you can. Because if you choose to see it as a great challenge that must be overcome and as some serious business you are obligated to finish, you'd bring a lot of heaviness into your recovery process, which paradoxically would become an obstacle rather than motivation and would create an unconscious resistance to learning new ways of being and functioning.

The tricky thing about healing trauma is that the process cannot be forced. It has to go in accordance with how far your body would allow it to go at each given moment. It's ok if some new things you try feel a little uncomfortable, but don't push yourself to a point where they would make you very anxious or frightened. The entire process has to feel safe enough to be effective. This is the major principle of healing trauma.

I have no joy in telling you that you'd probably have to do a lot of work on your own without professional help. Not because that's how I believe it should be done. On a contrary, I believe, people need a lot of professional assistance when they try to heal their trauma. The unfortunate reality though is that the qualified trauma recovery services at this time are virtually non-existent. Professional training, as it is now, doesn't equip therapists with the required knowledge and skills to work effectively with trauma. Most of the methods taught aren't based in solid science, but, to be fair, the current research is still insufficient..