infection? help

so i started having sex for the first time in august and i took antibiotics in september for a sinus infection and i got a yeast infection from the antibiotics. i got rid of it with monistat and all was fine. a few weeks later continuing to be sexually active with my SO i got a UTI and got antibiotics and an oral pill for a yeast infection. then, a few weeks later i got another yeast infection, and i took monistat again. 
Now i'm dealing with an itchy vagina and some white discharge but nothing like a yeast infection, also after sex a week ago it swelled up SO MUCH.
what is going on??? 
i don't know what to do because my mom is unaware that i'm sexually active and i really want to avoid that conversation with my parents.  

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