Nancy, I got diagnosed with Meniers disease. I have naturally low blood pressure and if I jump up too quickly or bend over too quickly I may get dizzy (I am an enegetic personality
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However, this was very different. It felt like someone had pulled away violently a board or platform you were standing on and you can't stop from falling as you are totally unbalanced. Then, when I was down, I would experience the worst nausea. I would still be unable to get up. After a while I would hear ringing (felt like someone was ringing or buzzing behind me) and when the ringing would stop, it was all over.
I have learned to recognize an attack coming on and I can prevent them from escalating. I only have a mild form of Menieres, meaning the attacks do not come on often as long as I follow diet restrictions, get proper sleep and deal with stress.
I do feel when I have sinus problems it gets a bit worse - my allergy and sinus problem go together. Again, diet restrictions are important for me, as is steam inhaltation and acupuncture to keep sinuses clear. I haven been told to use the Neti pot as well and many said it works super for sinus and allergies so I hope this will help me.
I also had two concussions (the last one 3 weeks post-op from my husband's surgery and I had to fight through it) so I had lots of episodes then, like two a day. Sometimes they would last up to 1/2 hour until I could function again, but then I was really, really sleep deprived and under prolonged stress. It has never been as bad again (knock on wood) as in those times.
All the episodes I had came on while standing, never in a sitting position so I am O.k. for driving a car.
Does this sound what your daughter has? I am wishing her all the best and hope she can find some relief!!