I mentioned this on another thread...You could try Altoids as a simple grounding mechanism. They are very stimulating without being harmful and they really help bring me back to reality.
You are right that there are other dissociative disorders and our dissociations are just as real (or unreal) and deserving of treatment. Good for you for talking with your T. It can be hard to trust a new one (especially after bad ones), but it can be worth it.