No; a toroid is supposed to be inherently free of field leakage.
The primary effect of leakage would be a feeling of warmth, as the RF is dissipated in your skin as it would be in food, to cause heating. I don't think dizziness would be a symptom??
If there is no physical damage to the microwave and the door closes correctly, leakage seems unlikely.
Any significant leakage would likely swamp any WiFi device, as they are on similar frequencies.
Is you phone WiFi signal affected by starting the microwave with the phone close by, compared to the signal in the same location with the microwave off?