The area where I had a tooth removed a long time ago has come off; should I go to the dentist immediately?

It's been a while, but the filling in my previous tooth has fallen out.

It's inside the upper left tooth. The removed part is falling off.

I keep getting nervous, so I have to go back and fix it again.

I don't think I can go right now ㅜ ㅜ ... What should I use for the ingredients?

That was also a concern, and before, I used gold.

May I leave after some time? Besides getting a filling at the dentist, is there anything else?

I think I have to do it... I'm scared, but I guess I should go quickly, right?