i have really bad mood swings. i do realise it is due to periods, however i feel really low kind of half way between two periods (i.e. about 2 weeks after i've started), and also about 3 or 4 days before my period is due.

any advice would be good, as it is disturbing me a lot. these mood swings are quite strong, and i reach a point where i cannot get on with anything without feeling down/depressed. i also cannot concentrate (my exams are coming up). i feel quite lonely. because i am a very happy person in general, i find these mood swings really hard to cope with please help

PS> if it makes any difference, i do also suffer from certain physical symptoms.. eg headaches and backpain.