I hadc thick white discharge, I used diflucan (fluconazole) abnd that didn't work. I used a three day prescription a fail. I'm usein Monistat it burns. What's wrong?

Maybe infection. Generally, thick, white, clumpy discharge is consistet with yeast and should respond to over-the-counter antifungal meds. Since this has not worked, i would recommend a trip to your physician's office. Occassionally, other infections can be present. Your doctor will make the diagnoses and treat you.
See your doc! See your doc. Sometimes stubborn yeast infections need other treatments. Sometimes it may be another infection like bacterial vaginosis [or a sexually transmitted illness], which needs a different kind of treatment. When things don't work, it's time to figure out what else might be going on. Good question. Hope you feel better soon.