Your story and question are certainly spotty and a bit hard to be able to base any sort of educated guess on.

If you were convicted of DWI and failed your original test, then didn't "show cause" the last time you were supposed to appear, you're very likely to have to face a drug test at the court's earliest convenience. You will probably want to make it your business to "show face" (meaning show up and appear) at your earliest convenience and either go in before the bench warrant is issued and submit yourself for any scheduled drug test you've missed through your program/probation. Or, if that's not applicable, show up at your next rescheduled court appearance, then face the music that you're probably going to have to undergo--and, I gather, fail--your next drug test. The "I had a big gaping wound" defense, if you intend to use that to excuse your no-show, needs to be presented at your earliest opportunity, too.