Suggest Remedy For Heart Palpitations And Hand Tremors

Hey, I m always feeling tired especially when I ve not eaten or drank, I get constant heart palpitations and hand tremors, I ve got an increased appetite as I m always hungry. I ve also developed thrush and acne on my legs, aswell my hairs began to become very thin? I wake up with brown stuff in my mouth and I can t put any weight on despite eating loads more! Am I overreacting? I m 19, 12 stone I exercise regularly.