The situation is annoying and not good, but am I right in thinking that you're more uncomfortable with the power of the rage you are feeling?

It sounds like your tutor's inability to get your work marked and back to you is triggering something deeper in you. You are infering from your tutor's behaviour that she is doing it because you are easy to forget or overlook? When actually the real reason is most likely that she's just really disorganised or really overloaded with work or lazy, it probably has nothing to do with you.

The rage is coming from your history, and because that rage and unfairnes you felt as a child hasn't been fully processed, it's transferred into present day situations and why the rage might be disproportianate to the present situation.

Not sure if i'm right about that but just thought I'd throw out some ideas, hope it helps