lightheaded

[JJJJ]

I am a 30 year old female.

For the past 2 years, anytime I drive over 60 km/hour or walk quickly I feel lightheaded to the point where I feel like I'm going to pass out (but haven't). This feeling normally hits me suddenly after about 20 minutes of driving at those speeds or after a couple of minutes of 'power shopping'. After I pull over (or stand still for a couple of minutes) I feel better (although a little shaking 'cause it scares me a bit). I have given up driving outside of town (except for a few test drives with my sister every couple of months to see if it's still there). There's no spinning sensation, I just feel like I'm going to pass out.

My doctor did some blood work when I went to see him (nothing showed up)and told me, to protect his licence, he'd have to take my licence away if I came back to see him about it. CT (for headaches) came back clear (although I couldn't get the contrast done due to an allergy).

Any ideas of what it could be? I love driving, visiting family and I need a car for my job. It's wrecking my independence!!!

In case it helps, I have history of headaches, migraines and a couple of concussions/whiplash from 10-15 years ago. Around the time the 'attacks' started I had a CT (for headaches) that came back clear (although I couldn't get the contrast done due to an allergy).

Thanks

[Sandallia]

Positional Vertigo perhaps?  A doctor familiar with it can check you for it quickly with a simple test.

Iron deficiencies can be a culprit.

Inner ear issues from allergies can be as well.  

I have what I call the wabbles, when I get out of a car and start walking.  Yours is delayed so I think it is a bit different. I don't know what causes mine yet but I have lived with it all my life. People used to say I was clumsy.  It has gotten progressively worse, though still not keeping me from driving, over the years.  In fact, when I am sitting down driving, or working at home on my computer or sitting to eat a meal, I am fine.  I have recently had my ears checked and had an MRI and MRA though one of those showed sinus issues.  I think now, though my doctor doesn't agree, it is sinus related snf you mentioned allergies.  I hope something I have shared helps.

[charley1986]

Maybe grasping at straws here for ya - did you have any sort of emotional stuff going on when this first started?  I don't know, just wondering if maybe this can be some anxiety...I have certainly had my share of anxiety and I know all too well how it can cause many physical symptoms - even though we don't know it.  I don't really have anything else that I can think of that could cause that.  I ask this b/c my mom was in an accident a long time ago and she has awful physical symptoms when driving more than a few miles from home...it has been hard on her having such anxiety.  Hope you find some help.  Good Luck.