Ok so about 4 days ago I had my tongue pierced, it's a little tender but the swellings no that bad. I'm suppose to go and have some fillings done, which never really bother me except my mouth is numb and I can't talk properly which I already can't do. But Will I need to reschedule my dentist appointment until after my tongue heals completely or would it be OK to try to have the work done?

Reschedule your appointment until after your mouth is back to normal. Not a good idea to go right now.

As long as the teeth that need fillings aren't bothering you it would be a good idea to let your mouth heal from the piercing.