Loss of libido could be due to dryness of the vagina.
And also due to a low estrogen and testosterone level.
HRT is not a good option for you - it increases the risks of breast cancer, uterine cancers and has a bad effect on he bones.
You could take phytoestrogens - these are natural estrogen present in food like soyabean and are effective in maintaining the hormonal levels with minimal side effects.
Other food containing phytoestrogen are tofu, soy beverages, linseed (flax), sesame seeds, wheat, berries, oats, barley, dried beans, lentils, rice, alfalfa, mung beans, apples, carrots, wheat germ and ricebran.
I hope this helps.