How you feel after surgery will partly depend on whether you had general or local anesthesia. The side effects of anesthesia depend on the medications given, often being more significant for a general anesthetic. You have to give time for the anesthesia to leave your system. The way you feel may also depend on the symptoms you had prior to your surgery (e.g. fatigue). These should slowly improve with time if surgery was successful.
For more information go the endocrinediseases.org:
Parathyroid Gland: Risks
Parathyroid Gland: Recovery
Parathyroid Gland: Benefits of Surgery