If I have hidden a portion of my model, then used the unify command in the deformation menu- how do I “unhide” the rest of my model so that it returns to proper proportions?

(as you can see… the face was unified with the body hidden- but when trying to unhide the body, it is all thrown out of wack)
***the reason why I am unifying a certain portion of the model is because it is the only way I can get the symmetry to work- I need the symmetry to work on the face, and the unify command seems to be the only option for me to get it to work… I am obviously new, and spent a lot of time on the base model- and have tried multiple ways of getting the symmetry to work…