Thanks for providing more information.
Well as you have intermittent diarrhea for few months so possible causes may include Irritable bowel syndrome,Intestinal parasitic infection,Gallbladder disease, malabsorption, infectious disease, crohn's disease, bacterial overgrowth, lactose intolerance, etc.
You should take metamucil,probiotics,eat yogurt.
Also hydrate yourself with plenty of fluids.
In case of severe diarrhea,Imodium can be helpful.
However as you are suffering from last few months so you should have the relevant investigations done like colonoscopy, ct scan abdomen, stool routine examination, etc. after consulting your doctor if your symptoms are not controlled.
Apart from this,vaginal rash,itching can be associated with vaginitis which should be ruled out in your case.
You should try OTC Monistat to see if it helps.
Also do warm sitz bath.
And your consult your doctor for further evaluation and management.
I hope this helps.
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