Have you talked to the treating surgeon yet? If you haven't yet done so, please do so immediately so that your current neural responses can be documented correctly and progress reviewed accurately.
It can take anything up to 9months for recovery, usually the mental nerve bundle is located and carefully protected during this soot of work. However, if it was extensive work, and the amount of swelling severe, then compression of the nerve is likely and that will take time to recover.
If it makes you feel better, the nerve bundle in question is often exposed for a lot of procedures and full recovery is routinely expected.
I think it is unlikely that the nerve was severed - even in those cases, most have some degree of recovery.
Did you have a genioplasty done?