I have a different answer for you
Joint pain on one side would not be likely due to a cellulitis of the leg[s].
Cellulitis is not typically of both legs, and you do not indicate any history [diabetes, trauma to the skin] that would account for cellulitis.
This sounds more like an inflammatory arthritis, mainly on the left side, with inflammation of the legs, possible due to autoimmune disease.
Or, you have two separate problems and cellulitis could be a result of immune disruption due to autoimmune disease.
If you don't have actual arthritis, a flu like virus can account for all of these symtoms.
I doubt that urgent care has enough to due full testing for you, and i fyou are really sick they will send you to the ER.
If you have coverage for an ER visit, fine, but what I would suggest is that you read by post to your doctors office and go in right now, as feasible.
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OK, so that is an initial answer….
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