Dear S.
Yes you could have a resistant strain.
Yes when you take antibiotics the bacteria can develop resistance to them.
Yes you could have a complicated strep that has moved into other parts of your body.
Also what worries me is what Type of strep you have. Strep can, and does travel through out your body, if left untreated, or the correct antibiotics where not given. You need a blood test to see if you have it in your blood. There are many strains of strep.
Some strains produce toxins that can lead to a scarlet fever rash. This rash is thought to be an allergic reaction to the toxins. Untreated, strep throat can sometimes lead to rheumatic fever. Kidney complications are among the other possibilities. Also heart and joint infections occur. The bacteria can travel to other parts of your body. When this occurs you need aggressive IV antibiotics, which the strain of strep is sensitive too.
Complications
Please see this Link also: http://www.nlm.nih.gov/medlineplus/ency/article/000503.htm
Return to the doctor and ask for testing to be done.
I hope this helps you. Good Luck.
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