Hi
Welcome to the forum!
The symptom you are facing of tightness of chest and throat and a lump in throat can be due to GERD or gastric reflux. This could be due to the effect of prednisone or due to your food habits or some drugs you took which increase the acidity.
The other possibility is that this unknown condition is also causing edema in throat. It could be allergy related too.
Malabsorption syndromes as seen in intestinal tuberculosis, HIV, tropical sprue, parasites in stool and Whipple’s Disease should be ruled out as a cause of low readings (low complement (C3, C4, CH50), low IgA, low B12, and low iron stores (shown in BM biopsy). Pernicious anemia, SLE or lupus (quite possible with rash and hair fall, high eosinophils), and other autoimmune disorders should be studied.
However without examining it is difficult to give a confirmed diagnosis and treatment on net. Hence consult your doctor and discuss these points. Hope this helps. Take care!
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