Post-Tamoxifen; Post-Menopausal?

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I recently finished my 5-year course of Tamoxifen.  more recently I started getting my period again, this past time very heavy for a whole week and now just light, 2-1/2 weeks after the start.

 Because I have osteopenia my doctor is giving me Evista (I haven't started it yet), which is specifically for post-menopausal women.  

 I'm very confused!  If I'm still menstruating, how can I be post-menopausal, and why then should I take Evista?  What happens if I do, and am not in fact post-menopausal?  I'm confused and stressed.  Can anyone shed any light on this?

Thanks!

Barb

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