I'm not sure why you are looking for only home remedies. We need to know what the problems are, it might be caused from a yeast infection, bacterial infection, yeast + abrasion, and you haven't said if you were sexually active or if this happened after you had sex recently. Maybe it's an STD, or an allergy, etc. It's really hard to tell from just the information that you have given.
It is so painful, you should really consider going to the doctor. I'm not sure what your financial situation is, but they are there to help you. You should not have to suffer with this. If it is a yeast or candida infection, there are countless articles and supplements from probacto that can help you.