Something happened to me a few nights ago and it's really, really impacted me psychologically.3 nights was a normal night for me like any other night. Then they completely changed. I woke up at 5 am for no reason. Moments later I started to feel really light headed and then suddenly got super hot and felt like I was gonna faint. I immediately went to the sink and ran cold water all over me as well as drank some cold water. I’m not sure what caused it but I think it was either due to dehydration or a stomach acid reflux from what I ate that previous night. Ever since that night I've been very scared to go to sleep in fear that it will happen again. In the mornings when I wake up my vision has been kind of blury and yellow which I've realized is due to the fact that ive been very stressed out lately(am currently going through some life changing decisions). Tonight I went to bed the usual time and woke up 30 mins later. As soon as i woke up, i instantly got anxious and entered this mode of "I hope im not going to get lightheaded again like a few nights ago." At this point I  feel like what happened a few nights ago was most likely a one time thing but unfortunately it has psyched my brain out into thinking of the possibility that it will happen every time I wake up from sleeping so now I feel extremely anxious whenever it's time for me to go to sleep or when I wake up in the morning in fear that something will happen. Idk what to do and how to get of this. Currently 3:30 am as im typing this. Was supposed to be sleeping but woke up and felt anxious that it would happen again so I went ahead and started drinking cold water again and pouring water on myself to cool down.