still dizzy

i have seen my family doctor for about a month about beeing dizzy.she is stumped,had 2 ekgs came back normal.wore a heart monitor for 24hrs-normal to. ive been geting dizzy and some heart palps just a rush of sweating. i had a pituitary tumor of 22mm removed in 06 . had mri done 12-07 every thing is normal. no ear infection or sinius infection. but the dizzyness is getting constant.its like going in a circle fast and stopping.sometimes it gets so bad i get sweaty and nausea and have to lay down almost like im going to pass-out but dont.my doctor is passing it off as anxity. sometimes i get dizzy and my body goes in the circles that im dizzy mostly to the right. im getting depressed no one seems to care, im worried about this. my family ignores my complaints. what could this be? any ideas would be helpfull, thanks