Feeling Dizzy and Weak?!

Alright so basically, I RARELY feel this way. The last time I felt this way was like many months to a year ago. What happened was yesterday night I felt sleepy so I decided to go to sleep. At around 1-2 AM, I started having a hard time sleeping. I can't really describe it in words. The weakness and dizziness that I felt caused me to wake up. My vision was all shaky and scrambled like. I wasn't like this before I went to sleep. This morning I woke up feeling the same way, extremely exhausted even though I got 9 hours+ of sleep. Has this happened to anyone before? Any ideas on what could have happened? The only problem that I thought could have caused it was excessive heat under my blanket, but then again I always sleep the way I did.