I am sorry. Probably you might return to put the camellia in his site. Does it know if the roots of the soil have gone out?. If the trunk is broken for him weight of the snow, it will have to cut it under the break and hope that the camellia returns to appear.
Regards and luck.

Camellias do not have deep roots so if it was growing at an angle (not straight) or if it was windy, that helped topple it. Just place it back in the hole as straight as possible and water if the ground where you live has not frozen. Cover with 3-4" of acidic mulch then top it off with some snow for insulation protection. Then consider using stakes around the plant to help it stay upright... the same ones used when new trees are planted. You may have to leave them there for 6-12 months to make sure the shrub will not fall again.

Thanks for the advice. We still haven't done anything with it. It is SO HEAVY! I couldn't even move it a tiny bit when I tried. We may have to get a few people to help out. I definitely think that we'll need stakes. It's right up against our porch so there is not too much room to work.

If we're not able to stand it up by ourselves, who do you think we contact. I know that this is a silly question, but would it be a landscaper? An arborist?

A landscaper would be my choice from a cost point of view although the arborist, while more expensive, -if it is a good one- could give you some pointers on how to prevent a repeat of this problem.

By the way, try to keep the soil around the camellia moist if the soil is not frozen. You do not want to cause soil moisture problems to the tree although it should be somewhat dormant (the leaves stay on and do not dry or fall though).