Please someone help

Br

So I haven't had a period since June 23rd and it was really short like only a day and a half. All pee test are coming back negative. I do have a doctors appointment for Monday. But I wanted to see if anybody else has go threw this before or could possibly give me some clue as to what's going on just so I can mentally prepare myself for my apartment.

I already have anxiety bad I have minimum 2 panic attacks a day and this has made it so much worse.

Any help will be greatly appreciated