why does the pill make me very sick now? when it never use to!?

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i use to take the pill since i was a teenager. i wanted to get pregnant in my twenties so i stopped. i have two little kids now. after giving birth to my second one the doc put me back on my birth control pills..the same ones i always took. ok WHAT happened to my body?? the pill NEVER had any side effects on me, none that i can think of. but when i tried them that time, it took 2 days before i started getting violently ill. nausea/vomiting/diarreah. i actually thought i was pregnant! i was having all the main pregnancy symptoms, but a million times worse and all at once. why was i able to tolerate the pill for SO many years, now i can't after having children??? i need to find a pill alternative, if anyone has any good advice on that? something that WONT make me sick!!!