Feeling Faint, Blurred Vision, Dizzy, Slurring Words. ECG And Blood Test Normal. Have Fibromyalgia

Hi, my names Hannah. Im 22, weight just over 9 and half stone , im about 5 7?! there abouts. I don t smoke or drink. for the past 11-12 months I ve been feeling on and off incredibly faint. it s so bad my vision blurs and I feel physically sick. The past week my eyes have become sensitive to light. Generally I m forgetful and a bit ditzy but I ve been having people say to me that I ve been slurring my words and forgetting everything, I haven t thought much of it but I ve been very emotional lately and not myself at all. I m hungry all the time and always tired n suffering for muscular pains. My GP has done blood tests, ECG and they came back normal. Something isn t right. I have Fibromalgia and am due to be sent to an ME clinic hopefully soon. I ve always had pains n swelling but the pains have increased and I m more tire than usual. Can t walk up the road without needing to sit. Please help? It s been getting me down. Thanks