Hi sinking, do you have any grounding techniques that you can employ? I know it's so hard and scary to get seperated from ones self, but the one and only thing that I cling on to is "I am".
If I wasn't real, I wouldn't be thinking these thoughts of "am I real or not"... you can't have one without the other. This one thought gives me a "reality anchor" from which I can use to find my way back by using grounding methods. I also know that my mind lies to me... telling me that I'm better off dead, the bipolar taught me that.
I don't know what it's like for you, I get just moments of it that lasts a little while, but in knowing that at least I'm real, I don't get to much anxiety about it. I end up feeling like I'm just floating in another dimension, watching and waiting, but not "lost" in it.
I hope you comfort in recovery.