It would be a good idea to talk to your pdoc if the meds are losing effectiveness. It's happened to me many times and we just switch to something else for awhile. Right now my pdoc has me alternating nights with different sleep meds so they won't lose their effectiveness so quickly. It's been working fairly well for over a year now, a record for me LOL...
I hope you are able to get some sleep soon!!
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From the movie The Hours: "If I were thinking clearly, Leonard, I would tell you that I wrestle alone in the dark, in the deep dark, and that only I can know. Only I can understand my condition. You live with the threat, you tell me you live with the threat of my extinction. Leonard, I live with it too."