Well done for trying to overcome your 'problem'. Who told you that being a bit concerned about spinning will preclude you from work as a pilot? I'd like to know what they base that opinion on...
What do you mean by 'abnormal attitudes'? Inverted spins etc? Unless you have had your aeros restriction removed, why would you need to teach that sort of thing?
I would say first of all that you need to assess what is required of you. As an 'ordinary' FI, you are not likely to be doing much spinning - it's not part of the syllabus after all. If your student has a valid reason for wanting to spin, you can always pass them on to someone 'more experienced'...
Secondly, try to think about root causes - do you fear being unable to recover from a spin?, do you find the sensations unpleasant? Is it actually nothing to do with spinning and more about some other issues (since you hint at that). If you can figure out the root cause, you can formulate an action plan to change things.