Trigger Shot in Stomach?

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Do you have a choice of stomach or thigh or bum? My nurse went over my trigger shot protocol, they do a dual trigger which is two different meds, and the second morning another dose of one of them. She crossed off thigh and indicated I should do them in the stomach. Whyyyy!!!? I feel so bruised and now the thought of a bigger needle in the stomach is making me anxious. What did you do?