If its is candida, than its a tough diet and lifestlye to adapt to. I have a friend who had the sames issues and decided to do the diet. Not only did the rashes go away, but she lost a lot of weight as well.
She had to cut all starch and sugar out of her diet. Also had to change certain meds she was using to treat the infections and rashes, cause it was making it worse.
You can google it and here is one page for you to look at.
Do go see a doctor about some of your issues, but certain meds can make the candida really flare up.
Do you have a Nature's sunshine herb store close by?