I think it's really helpful to add..
It is impossible to self-diagnose using Google
Google and/or Wikipedia cannot replace a psychiatrist's or psychologist's professional diagnosis. They also don't like mental illness much and are often skewed and biased by the users perceptions (ie you see yourself through your lens, therefore your perception of yourself is biased either positively or negatively... however much you refuse to accept this, it is true. Why do you think GPs cannot diagnose themselves or that therapists need therapy/supervision themselves?).
The best diagnosis is one which is worked through as a collaboration of mental health professional and service user (don't like the term patient and as therapists can't diagnose you wouldn't be a client in this instance either).
I also think... diagnoses are only helpful if they are used to inform treatment. So first off... are you still in therapy (you weren't clear on that) or LOOKING for therapy? If not, there is no point in diagnosing yourself with anything. Nobody outside the MH services will understand what you mean and thus will treat you like a hypochondriac if you try telling your GP 'I think I have this mental illness' (trust me, I've been there!!)
I also just want to share with you something I very recently learnt.... there are over 230 varying presentations of my particular disorder that I have twice been officially diagnosed with... there is no such thing as a 'perfect match' diagnosis. You may find 'the closest match' but nobody will ever have identical symptoms within a diagnosis. You may have dissociation as part and parcel of PTSD. Just the way it presents is different for you because you are unique. That's all. It's like trying to find your exact personality profile online, won't happen. You're too unique, made up of a mix of biology, psychology and environment. You can get very nearly there (I'm an INFJ for example) but it won't describe you to a 't' nothing ever does. Each diagnosis is therefore made while knowing that there will be a massive amount of individual difference within each case. If you haven't already guessed, I'm on the path to becoming a Psychologist (either clinical or counselling - not sure yet) so this is an area I'm passionate about.
What you have could be just a varying degree of dissociation. I have a lot of them; dissociation, depersonalisation, identity disturbances... I am bordering on having Dissociative Identity Disorder (used to be called Multiple Personality Disorder) but because I don't have amnesic tendencies when the various shades of my personality take over, I know I don't. It's not important to me to get that side of me labelled and correctly identified. I have various, often conflicting parts of my personality which group together and form 'identities'. But they are all actually me. I don't see them as being separate. Little me, teenage me, young adult me, and me as I am now (another reason it's not DID). Do I need to have this labelled? No. It's a result of trauma. That's all I need to know.
I understand your need, really I do. You're seeking validation. I get that, there is absolutely nothing wrong with that. But I think you're looking for it in the wrong place. The best place for you to find the acceptance and validation you need in order to begin realising you are more than any label is in long-term therapy. A label does nothing for you, trust me. I recently went through this and went back to the CMHT to ask them to confirm my diagnosis. They did. It did nothing for me. My therapist on the other hand said 'well I don't really think labels are very helpful... they kind of give a very stereotyped, narrow definition of a person... I'd rather get to know you, irrespective of that... I see what you experience as being simply survival tools that your mind has employed to cope so it's all valid... all of you is important, whereas your diagnosis... meh, neither here nor there'
The key to all this is acceptance - acceptance of who and what you are regardless of any label.
You are more than what is wrong with you, you are you. And that is totally acceptable.
