Help? what could these symptoms be?

i am tired more then usual, find it harder to wake up to my children, i've been getting cramps but in my , occionally i feel faint? like dizzy, it happens out off the blue at any time, and have been moody but not like the normal mood swings, i've been more snappy! then constantly bad mood swings.. my periode was the 9th dec, i had spotting for a day on the 27th dec and still no periode as yet?