Hi,
I rarely ever reach out like this but I'm to the point that I'm losing sleep over this.

It all started around the beginning of September. I had had my period a few days prior (around Sept 4 is my regular period)...On Sept. 10 My boyfriend and I had sex and our condom broke....in less than 24 hours he went to get Plan B and I took it (followed the instructions precisely).

A few days later I had horrid cramps and started bleeding quite heavily for longer than I ever have before... around 9 days (usually my periods are 4-5).
(This was probably around Sept 21st when it ended).

We decided we wanted to be safe and get birth control to keep another scare like that from happening... (Oh, I need to mention sometime in early October I changed my diet to a vegan diet)
On Oct 6th, my period was a few days late...I got an hpt and it was negative...I figured I was late because I hear Plan B can screw up your cycle pretty bad... We made an appointment to get me on birth control (thinking my period would come before the appt. ) Our appointment was on Oct. 31st....
I took 4 tests up until that day and all came back negative (now over a month late on my period). The doc told me I should be getting my period soon.
2 weeks went by since then and still no period (I took 2 more tests that came back negative) . Panicky I went back to the clinic, and they gave me a urine test and it still came back negative. I was told to return in 2 weeks if I still didn't have it. (that'd be Nov 28th)

So here's the deal, I don't have any symptoms (no tiredness, no nausea, no breast tenderness). The only thing I have experienced were little cramps (as if my period was coming). I have been stressing over this a lot and I don't know who to turn to. Any advice would be most welcome. Thank you.

Stop stressing. You've done all you can do to check if you're pregnant and there's just nothing left to do but wait. As your doctor said, plan B can mess things up. But stress can also do it. So getting yourself this worked up is probably only going to delay your period even more.