getting a diagnosis as an adult

I am have been diagnosed with aspergers traits but this was part of another psychiatric assessment .  I would like to get a fuller more clearer diagnosis.  I struggle with certain aspects of my life and I dont want to carry on feeling as if I have to cope with situations I find very stressful, this has been with socialising, environments that are busy and noisey etc.  I would like to find some way of having a clearer diagnosis and also any support for adults