the mid stream stuff is to do with avoiding "false positives" when looking for infection under the microscope, so pretty sure it won't make much difference.
The sugary / starvation bit shouldn't make much difference in a healthy chap.
Being cold / hungover could increase your bp in theory.
Experience on here suggests that the starting point for AME's is to actaully pass you
good luck, ginge.
(for the record Non doctor)