I need your advice...

I am having problems these past few days. And I really don't want to post it here in forums because I am ashamed that people might think of anything else. I am the type of person, who always do what's right. I am a clean person. I though this can only be felt if you are not clean and you are having a lot of partners. But I guess, I'm wrong. I have this itchiness down there and I know for a fact that this is not normal. I know that there is something wrong going on. Aside from the itchiness that I've felt, I'm having problem with my sex life. I felt like I don't want to do it anymore. I'm not like this before. I was shock with this change. This is not good because my realtionship with my husband is already affected. Due to this, I can barely sleep at night. I felt depressed about these things. I understand that the best thing to do is to have an appointment with my doctor but I wanted to find out what am I feeling. So what I did was to search online. I went to different sites until I found this one, yeastinfection.org/yeast-infection-signs-and-symptoms/ . According to what I have read I might have yeast infections.

Is this a serious illness? What do I need to do? Your help will really be appreciated.