Frustrated Freddie,

Your frustrations are not uncommon nor simple "rambling." A sexless marriage can cause great distress, and you reaching out to this community shows that you care about your relationship and are looking for ways to save the marriage and ignite some passion back into it. Unhappyguy is right, her prescription may be influencing her sex drive and I would recommend you speak to her prescribing doctor about it. Furthermore though, it sounds like she has an aversion or lack of appetite for sex.

I would suggest seeking couples sex therapy within your area (a good place to start is AASECT, although I notice you may be in Australia and there is one contact within Australia, although he may be a good place to start). Additionally look at resources about Sexual Anorexia and speak with your wife about if any of the characteristics resonate with her (ie. withholding love and praise, fear of sex, gaining control through limiting sex etc.). Begin with opening a line of communication with your wife and understand that there may be some underlying issues that could be out of your control but that you are able to help her work through.

Best of luck.