hi i have had 3 periods in 7 weeks,1st one as normal last two were only 3 days, had 3 pregnancy tesys including blood test all negative, have neck ache, crushing headaches the whole of my right side feels as though it has been beaten up,i have waves of sickness feeling come over me,dizziness, head rushes when i find it hard to keep my eyes open then extream tiredness, i am 37 yrs old and not sure what is going on, please help