I had a hard time with freaking our over small things for a while when I had very severe PTSD.
When this happens, remember that you are in no physical danger.
Try to find some coping mechanisms to help you calm down when you're freaking out... something like counting to 10 or deep breathing. Count really deep breaths until you can fall asleep, or try other strategies.
It could be that the things that trigger you are connected to a larger psychological underlying cause. Investigate if that's the issue. If you think there might be something deeper going on, find a counselor to talk to or try a teen crisis line.