|  |  | | SFD, whilst I'm in no way medically qualified to advise you on your menstrual problems, the symptoms you've described in the past do bear more than a passing resemblance to the same thing a close friend of mine went through for several years.  She had had menstrual cramps - violent enough to keep her off work - for some time, coupled with nausea, vomiting and bowel problems.  She went to several doctors who fobbed her off, pretty much telling her that she was a stupid little girl and should go home and take some .  After years of this, my partner - who studied nursing - told her to persist with her GP, who finally took her seriously enough to send her to a gynaecologist.  Said gynaecologist took one look at her and was horrified that her text-book case endometriosis had been allow to go on for so long.  Said friend is now finally getting the help she needs. 
 Whilst I certainly don't want to alarm you, or to make any mistaken judgement, the symptoms you've described do sound a mite similar, and it may be worth getting it checked out.
 
 
 The Endometriosis Association page can be found at:
 
 http://www.endometriosisassn.org/
 
 
 They also have an informative checklist, found at:
 
 http://208.20.109.224/endo/endro.html
 
 
 Hope this helps...
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