Recently I have noticed a feeling of dizziness while pressing to defecate, it happens especially when I am constipated and it's very hot. Then another time I had another episode while doing power walking that left me very shaky, nauseated and edgy, I didn't faint but nearly fainted. Then I have noticed when I am very tired especially emotionally I feel light headed.
I have generalized anxiety since I was very young and I wonder if over the years of panic and nervousness I have damaged my nervous system to the point that I suffer from this condition.
Could someone advise me on the subject?