What should I do?

So my doctor said i MIGHT have acid reflux and gave me Prilosec to take for it. If i do have acid reflux, its very mild. Im kind of scared to take Prilosec because i dont think i have it, but then again my doctor told me to and i dont want to disobey. If i DONT actually have acid reflux, is taking the prilosec harmful? Will it mess up my stomach?
What should I do?
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