NO you are not Schizo Keepingalice!
Your therapist is doing his job and very well by the sound of it. Did it help to write out everything that is in your head? Maybe you could do this instead of writing to T all the time. But if you were bothering him he would have stopped all email privilages after a while- not five years later.
If you were wearing him out it is his job to keep the proper boundaries in place so he won't burn out.
Sometimes our feelings just seem to much and we need to reach out to someone just to be heard or for clarification- there is nothing wrong with this or you.