Off Topic, need some reassurance

Today, for the fifth time in the past four months I hit the floor. Literally. Ended up in ER where they told me yet again that I am suffering exhaustion. Called my doc. Explained what happens -- Feel a wave of incredible exhaustion so strong that I can't hold up my body or move, fall to the floor, conscious but difficulty responding. Lasts about half an hour, fall asleep after. He thinks I might be having some seizure activity and has scheduled some tests. I know nurses don't dx and I'm not asking for that, but what I want to know is, I start clinicals in two weeks. If these are seizures, what does this mean for my nursing career? Is there tx for this? I'm pretty freaked out here. Not to mention all the class I'm going to miss in order to have these neuro tests done. Or, if it happens again. Can someone give me some words of encouragement? I know, I'm having the crisis before the crisis, but it is very hard not to stress out about this.