Poor you!
I like switching co's/UC's (I am a UL!) every session (or half session) cos you get to work with different people and if you dont get on you know that it is only for a limited period of time. But I also enjoyed the summer where although other staff rotated in and out I work with the same person for the first half of the summer and a different person for the second half of the summer cos not only did you get to know them you got to know their leadership style! And in the case of the second person I was like that with we really just complimented each other with our styles and it really didn't feel like work to work with her if that makes sense!
