Hi, i have problem, this morning i woke up and i felt normal as if it was a normal day, i did not eat anything and then i ran a bath, it was moderate temp so it was not too hot, i spent 10-20minutes in there and ever since i got out i have been feeling hot and cold on and off. there was nothing in the bath and ive never felt anything like this before. i haven't seen the doctor yet as i can't make an appointment because they're closed. my head feels heavy and it hurts a little, my heart (i have a heart condition called "tachycardia" and anxiety) feels weak and like its going to stop. but i don't know i have eaten cold food like fish and toast, drank a lot of water a orange squash. my temperature goes up to 100 for a minute then slowly goes down to cold and its been like this all day. my body clocking is wrong so i don't sleep at night and i sleep in the day i don't know if that has anything to do with it but it might be because i need more sleep, what could it be? is it serious? what do you recommend i do? thanks for reading.