no periods 4 1/2 months , burning in vagina no infection 46yr old female no periods for 4 1/2 months. not pregnant sterilized 6 yrs ago.and around three times a year am getting excruciating cystitiis like symptoms stinging in vagina cannot bear to be near anyone or to be touched.Like a hot poker! take paracetomol (400mg ibroprofen and use suducreme, drink loads and about 2 hrs later it subsides but need more of same pills on the 4hr time and later in day it all returns to normal. Is this hormonal or something else how can i prevent it? should i be worried about no periods. (have a clear discharge which stains underwear tea stain colour vag. swab came back normal)Urine dip stick test normal.