Myself Dr Josh- and I’m happy to help with your question today.
Well, from the description it sounds that you have developed Allergy to Niacin.
The most common symptoms of an allergic reaction to niacin are- general itching, rash and shortness of breath.
One may also get hives and eczema.
Also, Shortness of breath and other asthma-like symptoms can develop, such as the inability to breathe, wheezing and coughing. Itching can develop in the mouth, lips or throat.
This should not be left ignored and should be immediately checked in ER ASAP.
This can result in allergic reaction, called anaphylaxis, which can be serious.
One would require oral antihistamine like Zyrtec, you can apply hydrocortisone to the affect areas and apply a cold compress to affected part.
Best bet is that you should get it managed in ER ASAP.
Hope this helped
If you have any further question then you can ask me.
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