Hello! Here are my thoughts of all this:
1) First type of syncopes sound to me like orthostatic (blood vessel related) syncopes. Easiest and fastest way to diagnose it is to lay down, get your blood pressure measured after 10 minutes laying down, then (and only in presence of someone ready to catch you if you fall) you have to get up as fast as you can and measure your blood pressure again. It should be lower. And then measure your blood pressure some more times till it normalizes. This should indicate an orthostatic issue, if present, or even cause a syncope. ECG and Echocardiography are good methods to rule out any heart associated causes of syncope. So am sure your cardiologist is on the right track. A 24 hour blood pressure measurement could be also added to the list of tests. That could even reveal some hormone-dysregulation caused syncopes, if present.
2) the second type of syncopes, sound more to me like the ones caused by problems with the central nervous system (e.g. epileptoform syncopes). Those can be symptomatic (caused because of... fever, stress, psychosis, medication, tumor, malformations or old head injuries (also neuro-infections)...) or primary (caused by malfunction of central nervous system- the real epileptic syncopes and lighter forms). So your neurologist is on the right track too, I think. Because the MRI could rule out many symptomatic syncopes and EEG can rule out the primary causes (though they can not always be seen during the measurement, so it has to be repeated or some provocation tests have to be done, like stroboscopic light, sound, breathing tests etc. depends on doc).
My suggestions for now: be patient, let them do their brainstorming, dont drive a car by yourself, dont use potentially dangerous appliances, be always surrounded by good, reliable people. Wish you getting well soon! ;)