OMG! I am so happy to have found this even though I am late replying. I am only thirteen and have recently began to have some of these same symptoms. I recently got the flu, took some children's nyquil, and then woke up feeling what can only be described as slow responding and loopy. This was normal for nyquil, but I started having a panic attack, and then my heartbeat felt really rapid. Not to mention I woke up an hour after I took the nyquil even though it's supposed to knock you out.
Anywho, the next day, I felt fine, but had another panic attack thingy followed by a strange sensation that everything was unreal and that i was slow moving/responding. I also felt like my senses were totally out of wack. Next day, I felt terrible. Diarrhea, and hysterics with fever. Next day, my flu was pretty much gone, but I was left feeling always tired, even when I just got a good night's sleep. I haven't been eating much, but that shouldn't affect me enough. I feel like when I move my body, it just feels strange, either light or heavy, my eyes feel like they cant focus and just want to close, last night I was getting hot flashes through my palms, shivering, more like clenching muscles, and a sense of doom followed by a burning in the back of my head, and horrible feeling in my tummy. When I move my head, it too feels strange, but I no longer feel that anxious! I know it doesn't sound that similar to you guys, but it's actually pretty close to what you guys are feeling. Also, I'm getting visual snow(search it), and the erge to swallow more often. Also, moderate to severe loss of appetite.
I don't know if this has anything to do with it, but I've previously had anxiety seizures, not epilepsy, and thank you to whoever read this rambling, hard to decipher post. I just feel so strange and tired.