I have had a constant dull ache in my lower abdomen for over 6 hours now, i have had sharp pains in the back of my head , vomitted twice and every now and then i get stabbing pains in my lower abdomen that bring tears to my eyes. It started on the left but now its moved over underneath my belly button, i cant seem to shake it off, ive had paracetmol, what should i do ?