Thank you for your question.
I am Dr Saha, I shall try my best to help you.
The symptoms sound like allergy.
Often the cause of allergy may not be apparent.
In your case, delayed drug allergy is possible.
You can take claritin or benadryl now.
If the symptoms do not improve, you need to go to urgent care or ER.
You may need prescription grade antihistamine , sometimes steroid too.
You need to discuss with your doctor about continuing your medicine.
I hope this information helps.
If there’s anything else I can do, please let me know.
If you are satisfied, please rate my answer as good or excellent.