What Causes Body Weakness, Sleepiness And Chest Pain In Young Adults?

I m girl age 19... studying in university 1 yr has gone. i m a patient of thal minor. Sir, i m suffering from weakness that is increasing day by day. Im becoming needy for more and more rest and sleep. After some hardwork i need rest so importantly that if i dnt then i m ill for 4 to 5 days. I have pain in chest that squeezes me and i comes under high pain high means very very very much high. My breath are fast and pulse is like 89-104. Sometimes i also feel like stretching veins in arms and legs that ultimately brings a shock pain to my chest. I have a constant headache that comes deadly by times and becomes low at times. I have pain in my muscles and joints and my upper back and lower back is always in a great pain. My hands my legs and my muscles becomes fatigue faster in a lesser time then before. I have a minor fever also at nights usually. My stomach is always disturbed. I have 6 hair turned white! I have done an ecg that was normal some blood test told me that hemoglobin level is low because of thal minir but thats normal in it. Tell me wats wrong? I dnt knw wat does dr. Are saying cuz they are not understanding my situation everyone is saying its normal its normal only i m the one who is overthinking on health.