You should wait to donate "double red" (also known as Power Red) again for four months. Because yes it does take awhile to rebuild after getting that much taken out. That's standard procedure, and if they said otherwise they were wrong. According to the Red Cross, double red can be donated once every 112 days.
I donate a single whole plus platelets. I can do that once every 60 days. I learned the lesson the hard way last time though: make sure you have eaten a full meal within an hour prior to donating blood. Not just a snack. I almost passed out when it was time for me to get up and leave.
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