Suggest Treatment For Severe Allergy After Consuming NSAIDs

Hi. i recently had a severe allergy after consuming NSAIDs and was prescribed antihistamines and prednisone. The swelling went down but after two days, I developed a mild fever and uncomfortable heart palpitations. The heart palpitations come on and off especially after extended periods of movement (e.g. climbing stairs). I also noticed that I became less tolerant of heat and was sweating more. My appetite is poor and my heart beat increases although there is no visible change around my neck, I do feel a discomfort around my throat, especially around the thyroid. The discomfort is not painful but annoying, especially when during swallowing. Could this be subacute thyroiditis? I have had no prior episodes of such symptoms before this.