Without being damaged by the medication change you have no case. It is only of academic interest whether one of the doctors fell below the standard of care. I suggest you find a doctor you trust ad stick with that person.
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The first doctor may very well have been negligent. However unless that negligence did in FACT cause you an injury this is not a viable claim. The law does not recognize what might have happened but what did happen. From your description, it does not appear that you suffered any permanent harm by what might be the doctor's error.
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You do not say what, if any, injury you think that you sustained from the failure to properly medicate you. It sounds like it caused a temporary spike in your levels only. Accordingly, even assuming malpractice, there is no viable claim to be made.
The other responses to your question are on point. It all comes down to whether there was an actual, tangible, injury. If you did not suffer an injury, there is nothing to gain by filing suit. Your doctor may in fact have been negligent, but it's ultimately only one factor to a viable medical malpractice claim.
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