Taking Vitamin D can cause a temporary increase in PTH levels, but this should normalize pretty quickly in the absence of true hyperparathyroidism. You can ask your doctor to retest...
Don't start one. Nobody is pressuring you to. Just enjoy the moment and the rest will sort itself out. If you absolutely have to choose, try to decide which one...
Follow up with medical professional. Endocrinology is complex and as such, results should be reviewed and plan should be guided by a medical professional. This site is educational and not...