I am so MAD!!!

so, on tuesday i went to the planned parenthood here in town for BC pills. i told them i wanted the Mini-pill because i am breastfeeding, and they told me that it is safe to take combo pills as long as baby is at least 6 weeks old and milk is well established. so i'm on ortho-novum 7/7/7 now, and i started that 3 days ago. my 3 month old son has been SCREAMING ever since like he is starving, and i don't get the letdown feeling anymore. and my breasts feel EMPTY like theres no milk being produced. i feel so bad. i love breastfeeding my son, i dont want to have have stop because my milk has dried up or whatever, but i worry that my milk won't come back now that it has started to disappear. what the hell is wrong with people? i told them i wasnt comfortable with the pill and they gave it to me anyway, telling me that since i was on depo and my body reacted badly to it that it would do no good to give me the mini-pill because its the same thing. grr!!!