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Hello. Dr. Ashori here. Please give me a moment to reply.
Sorry you are feeling this way.
You can take some zyrtec or allegra to alleviate the symptoms.
Such allergic reactions can last anywhere from 1 week up to 3 months.
They generally get milder and milder as time goes on but unfortunately it isn't easy to predict the duration.
however, don't be worried about anything serious, if it was going to be something serious it would have manifested itself as such already.
The shot will leave your system usually in the first week.
But the effects can last a little longer.