Back from jamaica w/sore throat, sinus cong, drainage, and dry cough -7 days now. cold?

Travellers' virus: Sinus, cough, congestion, & sore throat after stress of travel, unique environment, loss of sleep, & airplane atmosphere common. A novel virus is oft explanatory. Antibiotics are oft useless; unlike rest, vitamin c, clean fresh air, healthy food, & passage of several days. If yellowish sputum, shortness of breath, chest pain, or escalating fever manifest then a doctor visit is in order.

Could be: It could be a cold or a sinus infection. See a doctor for appropriate diagnosis and treatment.