You probably do not have a case worth pursuing.
The first consideration is that you probably can't recover enough, even if there was malpractice, to make a lawsuit worthwhile. (Malpractice suits are among the most expensive to pursue, because you need medical experts.) You can only recover compensation for unreimbursed/out-of-pocket medical costs, lost wages (if any), and for pain and suffering if you suffered prolonged or lasting pain or disability. If you had a fairly brief duration allergic reaction, unless you incured significant medical costs from the treatment for the reaction, it would not be worth suing.
Second, it's not even clear there was malpractice--if they were no reason to suspect you had that allergy, giving you that medicine would not be malpractice; and if your reaction was being controlled or managed and was not life threatening, it may not have been malpractice to have not gotten a doctor to look at you.
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