Strange situation,
I to have ben there. Here is the thing to keep in mind is it took you years to get realy good at what you do and it will most likly take a long time for some one else to get as good as you are now this is a piont that need to be told to your boss. This is a two sided coin in the event he (your boss) is getting you some help (I.E. all work no play, will age you very quickly) AKA burnt out.
Seeing as you will have to teach and be responsible for what is learned I would think a raise in pay would be in order. Else the alternate is a new job or self imployment.
This is a strong possition to be in, handle it more commen sense and less emotion and it should work out great for all.
John |