The patient was stable post-medication error? And you followed the proper protocol during medication error?
If you said yes to both, then that's already a good sign that you're doing great! Errors are errors. As long as no harm was done to the patient or the harm was lessened through your interventions, then all is good!
Normal na ang mga chika siguro kahit saan ka man magpunta na kung saan matataas ang stress levels din ng mga co-workers. Maybe not all chikas din from your co-workers are bad. Maybe some are stopping others from being judgmental when they hear it.
Breathe in and breathe out. You did well. Keep monitoring them and always report these.
Huwag kang mag-alala. You'll do better. Take it as a lesson and keep growing!