I never had this sort of attack but I do get panic attacks & have suffered pre-menstrual bloating with gas so have some idea of how you feel. It must make it worse, knowing that it will happen every month.
Do you have any other stomache or bowel related problems - I ask because one thing that occurred to me was diet. Not as in losing weight but if you have an auto-immune disorder (irritable bowel syndrome for one) you might be eating foods which your body can't tolerate - or which your body can't tolerate at certain times of month due to your hormones being "different" - I would suggest that you do some on-line research (google or yahoo) re affect of hormoneal changes on stress, also on bloating of stomache & on gas.
Some further research (one place to start would be lowcarbfriends.Com - ibs sufferers etc use it) into what foods you may be eating which may be ok for your system normally but not "then" - also you could talk to your dr about getting your hormone levels checked at different times during the month - I know they'll alter but perhaps if they're altering beyond "normal" limits that knowledge could assist you.
Do you have panic attacks at any other time?
Do you/have you practised the meditation & focussing on a regualr basis for several months? Because for these to work you first have to "learn" the process so that you can put it in place "instantly" when an attack occurs.
Have you looked into cbt (cognitive behaviour therapy) which many colleges & hospitals run free or cheap courses in - there's alsoa book - which I can't get here!!!! But which I understand is excellent - been there done that, do this! By sam obitz