Maybe you don't have any specific trauma to remember? All the issues you are struggling with can be attributed to so many different things - if you aren't making any progress, could you consider seeing a different T? I don't think you have to know for sure where your feelings "originate from" and I think your T should be able to help you regardless. Not every T/client relationship works and I would say after a year you should be feeling progress. No matter what, don't blame yourself; you are worthy to be happy/healthy