Well from what you are describing it sounds like that you may have developed a simple viral or bacteria infection of the throat. A sore throat and/or neck pain and swollen lymph nodes all point towards a viral infection more often than not. While a bacterial infection is still possible, usually you would havea high garde fever with most bacterial infections. Secondly since you have been exposed to children who have been coughing a lot it is even more likely that you have a viral infection which by its nature is self limiting.
Now that being said, it would be best to have this evaluated especially if you have had this for more than a week. A simple clinical examination would determine if there is a bacterial infection and also certain tests like a quick strep throat test along with possible bloodwork would help in diagnosing a bacterial infection. In such a scenario you would be started on antibiotics.
WHile HIV can be a possibility but it usually causes enlarged lymph nodes on both sides of the neck, one sided enlargement can be another viral infection or even tonsillitis on the left side. So HIV is less likely here.
lastly, you should NOT be using azithromycin off and on, you should be using this consistently or not at all, as intermittent use would give rise to resistant infections as well as difficulty in eradicating the bacteria. This would also decrease the efficacy of the antibiotics as well.
Now i would suggest that you DO have this evaluated and in the meantime use OTC tylenol for the sore throat and if needed gargle with tylenol mixed in with warm water which will soothe the throat as well.
Do you have any more questions?
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