WHAT can I do about EXTREME TENSION, RESTLESSNESS, AND NERVOUSNESS due to QUITTING SMOKING (30 cigarettes a day)?

Hello. Does anyone know what one can do against stress, strong inner tension and nervousness? I was a really heavy smoker for 2-3 years (about 30 cigarettes a day) and I'm quitting smoking TOMORROW. But just when I think about it being a few hours away, my hands start to shake slightly, and I'm so…