I have to use quick fix again. Extremely anxious.

I haven’t smoked in over a month in prepreation for an upcoming drug test for a job. Today I took an at home test to double check, and I tested positive. I used quick fix before and passed however it was extremely anxiety producing - the anticipation and being there with the quick fix was horrible. Any advice, reassurance would be amazing. I’m so anxious I can’t even eat.