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Do you take any supplements or medication?
I would personally experiment with taking in more liquid volume. You say that dehydration is a problem, so try to add water to a lot of what you eat. Soups (canned soups will add some sodium for you, which can help raise blood pressure), smoothies, chewing on ice, making sure you always have a bottle of water/juice handy to keep yourself nearly over-hydrated.
Try to make sure that you're not taking in many diuretics if you can. Coffee, tea, overdosing on water-soluble vitamins - try to cut them out for a little while.
Have you tried running in the afternoon/evening? I used to work with my trainer in the morning, and would experience quite a few bouts of dizziness and a reduction in strength. When I moved to working out with her in the evenings, I was able to go further, harder, and faster and rarely had the dizziness issues. In my case, it may have been low blood sugar in the morning from a lack of food in my system, as well as dehydration. You might want to try moving your runs to the evening and see if that helps. Also, eat and drink immediately upon waking up (this is where I recommend a smoothie, then some solid food to fill out your breakfast an hour or so later).
Good luck!
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