Citalopram and dizziness

HI I was on 40mg of citalopram for 6 months and decided to come off them. My GP said wean off over 4 weeks but i did it over 6 weeks to make sure . Soon after the dizziness and feeling sick came along ,after 4 months it was still there so im back on them as i couldnt stand it anymore.2 months on and taking 20 mg im still the same . Anybody done the same and how long does it last ?.Any suggestions and answers would be appreciated . Many thanx

Drink lots of water.