I can't believe I used to drink this stuff daily

I haven't drank caffine in around 3 months, I have had some chocolate, and the occasional iced tea, but those were rare, I got super poor sleep the other night and decided hey whats the harm in drinking a monster this morning, but like 20 Mins after I did that I started shaking from the caffine and felt like I wanted to throw up, this didn't last terribly too long, but I felt like shit the entire day and barely ate anything, and when bedtime rolled around had trouble sleeping and on top of that had nightmares, I'm so glad I stopped, but holy it's crazy what thag stuff does to you