No period after pill

Hi Ladies. I stopped taking my birth control pill after 10 years in May. It got a quick two day period in June, a faint half day period two weeks later and now nothing. I've taken several negative tests but I'm on day 43 without a period. I've packed on about 10 lbs that are so stubborn and won't go away. Has this happen to anyone?  Any suggestions, especially with the mystery weight gain? Thanks!