Black outs, seizures, headache, weakness, slurred speech, dizziness. test done, eeg, ct, mri, blood work. all negative, what other test are there?

Atypical migraine: is a possibility but I am suspecting seizure disorder in spite of negative EEG. Ask your neurologist to consider video EEG monitoring for a period long enough to catch an event.

One suggestion: Echocardiogram testing sometimes shows a large PFO in a case like this, and it might be considered an option. It is good that the other tests are normal- don't give up.