I`m guessing this is to do with your mentor on placement. If so then, yes, If you feel that you have not been treated in a professional way (as you outlined in a previous thread) then you have every right to make a complaint.
Do you have to re-take your placement ? I guess you wont be doing this till the hols now, could you see about getting some bank work in the mean time. This would help build your confidence and ability to be a good nurse as well as (if there were any problems on your part) allow you to iron them out before your next placement.