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Hi Eve, no, no blood tests for these - I have been having spells of sudden dizziness, heart banging in chest, almost fainting and a feeling of 'not being here' together with fuzzy vision and like my eyes are about to pop out of my head, I had a bad one last weekend, the worst Ive had so far, after this 'attack' I felt clammy, sweaty, shaky and fatigued and slept for the rest of the day. My GP said it could be heart probs or thyroid - its not a hypo and my blood pressure is fine.