What to expect switching from Spironolactone to Leuprorelin (Prostap / Lupron)?

[mfox]

So I've been on Spiro since I started HRT over 7 months ago, but my endo is now switching me to a GnRH analog, Leuprorelin. 

Does anyone know what to expect when this happens, like mood changes?  I was reading about the initial "flare up" of T  which has me worried.

I'm also concerned about the potential side effects, like irregular heart beat or congestive heart failure.  Has anyone had any bad side effects from Leuprorelin?  I haven't had any side effects on Spiro, except a salt craving.

Thanks!