I would recommend seeing your doctor right away. I am not a doctor and not qualified to offer advice on this issue. I would recommend describing your symptoms to your doctor and getting all necessary tests done to rule out more prosaic causes of your symptoms such as a sinus infection, some type of allergic reaction, lyme disease, etc., etc. If that doesn't reveal the cause then you should see a neurologist for further testing into more serious possible causes.
I think the ambidexterity exercises and your symptoms are probably unrelated. When two things take place in close proximity it's easy to link them up and see one as the cause of the other, but often it's just coincidental. Various ambidexterity programs and fads have come and gone but I've never heard of any related problems.
The parts of your brain that control movement are the sensory-motor cortex and the cerebellum. Each half of the sensory-motor cortex controls the opposite side of the body. I can see how one could improve dexterity via excercises but not how any "hemispheric dominance" struggles could ensue. I would imagine if such a thing were even possible we'd be hearing a lot more about it from a variety of athletes, musicians, etc. For example many left-handed people learn to play a right-handed guitar. In the past, left-handed children were sometimes forced to write right handed in school. Just playing the piano involves a great deal of dexterity in both hands.
In any case, you need to see your doctor. Please give us an update after you've seen your doctor.
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