You have many problems. Redness, itching, swelling and white discharge per vagina indicates any infection. You have history of yeast infection too. Itching in anus may be due to yeast infection or worm manifestation. Constipation is also a big concern. Chronic constipation leads to piles, fissure, or fistula. Please consult homoeopathic physician. In homoeopathy physician ask the detail of each and every complaint and give single remedy which not only cure your problem but develop the immunity to stop it's recurrence. Treatment may last 5-6 months or more but you will find the permanent solution at the end.