I Believe That I Have Systemic Candida Overgrowth. I Have

I believe that I have systemic candida overgrowth. I have gas, bloating, oral thrust, diaretha, and constipation. I have a lesion on my nose that won't heal. I went to a walk in clinic. The physician's assistant would only prescribe nystatin. This drug does not get into your blood system. I was hoping to get diflucan, which does go into your blood stream. Eight years ago I had an operation for diverticulitis. About a foot of my colon was removed. I think my diverticulitis was caused by systemic candida overgrowth and I have never been cured from this. what do you think and what should I do. I am turning 65 this month and I'm on medicare.