Hello, Uvula gets swollen when there is ulcer on it, even small ulcer could cause it to become edematous and there is pain while swallowing. Secondly there can be a viral infection in the throat . You need to consult an ENT specialist for examination and to rule out the causes. till then take a mutivitamin and continue gargles . If you do not have fever then the viral infection will go in few days. And if ulcer is present will start healing even with a single dose of multivitamin. In doubt do reply.