im 13 and healfy wait and size had my periods since i was 11 for just under a year it was fine then suddenly i had it for about 4 months on and off heavy and light but constantly and had *giant* bloches, after it stopped for about a week then for about a month it happened whenever it wanted like rely heavy one day then none the next the a little bit it finally stopped but i didn't have it for 3 months after it started again for ages then i finally told my mum because i was feeling dizzy and couldn't breath properly i could barley walk and my face was bright white so my mum took me to the doctors and i got a blood test saying i was anemic after 3 months i was fine again and i got givern tablets to slow down my periods but there not working my periods are still heavy and un natrually long and iv started to also feel dizzy and keep running out of breath again the tablets worked at first but gave me bad stomach pains so what should i do ??