Hi, Thanks for the query. I understand your concern. The spinning of head at 33 weeks of pregnancy can be due to blood pressure problems - - When the blood pressure is low, it still drops down in standing position (postural hypo tension ) this can lead to spinning.Iron replsacement before getting up is nor having any effect to stop the spinning .. but taking plenty of fluids with sugar & salt through along with all other medications advised would help. - High blood pressure can cause spinning with head ache. High blood pressure is concerning in pregnancy... Here bed rest/ restricting salts in diet/ positive tension freee mentality along with medications suggested by doctor are helpful. - some times middle ear problems/ sinusitis/ allergic problems can lead to spinning( vertigo ) & treatment is very effective once the cause is found. - Many a times eye sight problems can cause such spinning. * In this context to visit your treating doctor & get serial blood pressure readings would diagnose type of BP High, low or normal ( Doctor may suggest to check urine for albumin.. in case BP is high ) ../ & check you for any other cause for the spinning . Once the cause is known specific medications would control your problem. -Please don t worry. Thanks.