I'm freaking out. My daily anxiety supplement/medication, which I am running out of, just got delivered to an Amazon returns center. What should my next steps be?

It's valued at 170 dollars plus shipping, but the important part is that I'm running out and take this daily. This is something that needs to be weaned off gradually when discontinuing.

It was supposed to get delivered today WITH SIGNATURE. I was planning to be home all day to sign. less than an hour ago I get an email saying it was delivered. I look on the porch, it is not there. I check tracking and it says it was delivered in a different city and signed by "Amazon" The address is a returns center.

I'm really panicking here. If this doesn't get sorted out by next week I will be in for a very rough time.

What should I do?