All throughout my childhood I had bouts of vertigo. Fluid would get into my ears, cross the ear drum and get stuck around the eustation tube. Recently, I had a severe bout that lasted almost a month. Decongestants and Meclizine would help but it would just come right back.
I spoke with a good friend who is extremely knowledgable about herbs and she said she has had a similar problem. She uses a mix of Fenugreek and Thyme. She said its also good to use Pcynogenol as well. I have only been using the Fenugreek and Thyme mix but I have noticed a huge improvement. The mix of herbs is also good for general sinus clearing. Drink lots of water though because this will pull the fluid out of your body. Hope this helps!