I Have been diagnosed with underactive thyroid and anaemia during the last year. However I have been having tingling in hands and toes for over 2 years and am awaiting a nerve conduction study. However during the last few weeks i have been feeling faint, with bp reading as low as 80 over 50, I am also very thirsty have a sick stomach and feeling weak. I wander is this coming from underlying health conditions or something else.