Bad student evaluations
The first thing I'd do in your situation is to get as much information as possible from the evaluations, especially from the students' comments. What exactly did they not like? Was it something about you or about the course?    There are lots of reasons for bad evaluations. Some reasons are things you should pay attention to and change. Other reasons are beyond your control. Did the student population consist mostly of students who didn't want to take the course but needed it to fulfill some requirement? Did the course meet at 8 a.m. (or earlier)? 

If you haven't taught this course before, you might want to get some statistical data on the evaluations other instructors got in the same course. Some courses are just really unpopular and produce lousy evaluations even for the best instructors.

As for renewal of your appointment, that depends on your department's administrators and the numbers of students who need to take your department's courses. The administrators may know that the course you taught always yields lousy evaluations, in which case there should be no problem. Other presumably relevant factors include your general reputation as a teacher (e.g., your past evaluations) and the actual evaluations that you just got.  (You said they were "horrible" and "the worst" you've ever gotten --- but might it be that your past evaluations were excellent and these new ones are mediocre, so they're your worst and they look horrible to you but might not be horrible on an absolute scale?)  But in general, the only way to find out about your situation is to talk with the relevant administrator(s).