thanks for your query, i have gone through your question, the altered taste and smell could be secondary to your cold and sinusitis, the increased wbc count suggest infection of the sinus and eosinophillia suggest some allergic condition..the soreness of the mouth could be an aphthous ulcer or herpetic ulcer secondary to stress or nutritional deficiency, consult a oral physician...nothing to worry take topical anesthetic and analgesics and do saline gargling 3-4time daily...take a course of antibiotic for the sinusitis after consulting ENT surgeon....i hope my answer will help you.. take care..