It would be easier for us to help you answer your question if you could give us more information. Has your doctor diagnosed you with anything? What treatments has s/he prescribed?
Based on what you’ve said so far, I’m guessing you have a chronic yeast infection. If so, these can be very hard to cure and extremely frustrating. You may need to treat the infection and the symptoms separately. To deal with the symptoms, you could try topical cortisone cream or diphenhydramine (but be careful, this will put you right to sleep).
To treat the infection, your doctor can prescribe you antibiotics like diflucan, but it sounds like you may have already tried that. You could try some home remedies like yogurt or making a pessary out of garlic.
Consider also anything that might be causing or aggravating the infection. Did it start after you started using a new soap or detergent, or having sexual contact with a new partner? Has your diet changed? Has the weather been unusually warm? Have you been exercising more?
If you can post back with more details, we can do our best to help you more. But as the above posts mentioned, your doctor is probably your best resource at this point. Good luck.