i have been feeling weak some how for sme time,and also last two weeks,i notice a little blood was in my mouth which i spat out and my throat was very dried,though i had nt taken water frm the previous day,and after that i never experienced that blood issue,but i still feel weak some how,and i noticei cant sit for long,becuase,i wpuld start having some bck pains and discomfort,and guess you know hw it feels when some one looses blood,i feel that way as well.what could be wrong