I am dizzy almost all of the time. I tell people that it is my most debilitating symptom since it hampers your level of activity. I don't even really get hungry anymore, unless it's been like all day since I ate, because of it. I tried Antivert, but it made me too sluggish. There are three things that help with this for me; marijuana, exercise and taking a very cold shower and gettings lots of cold water in your armpit area and areas where veins are close to the surface. I have a very screwed up bladder, but if I had to give up a symptom, it would be that first. It has really gotten bad for me this year.
The exercise helps me the most and I don't really know why. It makes sense to me like this: I think that somehow I "push past" my symptoms. In other words I exercise as vigorous as I can and everything flares up. If I push through it, I can get to a point where I'm not dizzy. It stays that way for a good, long while too. About two months ago I wasn't exercising at all. You know just feeling too awful, sometimes I can't push past it. Well that is when I get really dizzzy. I came out of it, started exercising, and my dizziness vastly improved. I also think it may have something to do with endorphins. I really have no scientific understanding of that, but from what I've glossed over, it seems to fit.
Another thing that helps slightly is the Diazepam I take 3x daily for my bladder. When I forget that I also get dizzier than when I'm diligent when taking it. It's only a small amount (2mg) so it doesn't make me tired, but it seems to work a bit.
So for me it's exercise, get cool when overheated, and smoke pot. I can't smoke all day since I work, so I just do it before bed. It's close to exercising to a good sweat for the dizziness, but it's not for everyone. It would be if everyone gave it a try (shameless plug for medical MJ), but some people just can't pull the trigger.
I hope this helps. I hate this symptom with a passion. I wish you luck. If you find a technique that works, make sure you share it with the group. I, for one, would try just about anything to rid myself of that one. Good luck.