After menopause, it's common to get vaginal irritation and burning due to low estrogen. The low estrogen results in very thin, brittle vaginal tissues that are prone to irritation and infection. If that's the cause, it can be resolved using vaginal estrogen cream.
Yeast infections are a common cause of vaginal burning and itching. They can usually be resolved using yeast medications.
There are other causes of vaginal burning and irritation, such as lichen sclerosus. This usually causes a slight whitish appearance to the area around the vaginal entrance. It's treated with certain steroid creams.
Sometimes itching and irritation are due to contact dermatitis, which is when the skin is reacting to something that came in contact, such as soap, cream, laundry products, etc. That's treated by removing the cause and using 1% hydrocortisone cream.
So I would recommend seeing a doctor to figure it out. An exam plus a smear of vaginal secretions will usually tell the cause, and then treatment can be directed to the cause.
In the meantime, sitting in warm water with epsom salts will usually be soothing and healing, regardless of the cause. Best wishes.