Melting & Dissolving

Though I wrote just two days ago that I'm gonna start looking forward to things more and plan my days better, I am worried about this lethargic state I'm in.
I think it could be the massive carb overload lately and the lack of gym sessions, but also the lack of minerals and vitamins (hence the supplements).

Also lately, I'm not sleeping that well. It's been months since I went through a whole night without waking, though some nights I go back to sleep almost immediately. Other times it's a lot of tossing and turning. The past weeks it's been more of the second, and most days of the week I don't fall asleep until really late/very early, or dream about these insipid things, like people I used to know showing up for no apparent reason and without really interacting with me, or me going somewhere and never getting there, or me just waiting. They're not nightmares, but neither are they good dreams, cause they consistantly leave this sense of restlessness after I awake that gets me stressed out or exhausted.

This week was OK all in all. I met friends, I got work done, I studied and watched movies. And today, things started so good. I spent time with people I care about, I ran errands, studied, took a walk in the sun, had coffee. I called my sister and said I hoped she had a great time at the concert tonight. I called my dad and congratulated him on his birthday.
Yet, on the way to the gym, this sudden feeling a void just struck me, and I felt like someone had punctured a hole into me. By the time I was on the mat doing the pilates-exercises, my hands were all numb and I felt like I was reacting to the instructers voice coming from another room. For a while I kept looking at my hands, feeling like they weren't mine. It was this strange sense off dissolving, like I couldn't even pinpoint where I was. And I felt so tired. Just from the street outside the gym I felt so suddely exhausted I wanted to cry, and afterwards I couldn't wait to get home.

So now I'm here, I've had dinner, and I don't know where the last 3 hours went. I can't think of anything I've done. And I'm so tired still. Why am I like this?