Oxium

Okay first let me say that I've had a lucid dream before, and I want to have one again. I have created a dream journal that I write in (Its actually just a piece of paper :D) and I wrote my first entry last night. I've have been trying to lucid dream, but some weird things have been happening. First thing is when I "TRY" to lucid dream my arms feel like their becoming heavy and I start to feel dizzy or kind of like i'm floating (this is like after 20 minutes of just lying there). Then I start to feel like i'm not on my bed. It feels like my body is asleep, but I feel like i'm awake, and when I close my eyes even for extensive amounts of times I still feel like i'm making no progress. After an hour I just stop and forced myself to get up. I went to the rest room, but while I was looking in the mirror it felt like I was in a dream, and I felt literally insane. That was probably just some side effects , but I really want to lucid dream, and I want to know what i'm doing wrong. Thank you.
(Sorry for the long read, this is my first post and I needed to find a place to post this.)