I get jittery and queasy on anything like No Doze as well. Once upon a time my husband bought some caffeine-based party pills when we were planning to be out at a dance party all night. The packet said to take 3-4 so he took three and had a fantastic night. I took the remaining pill and spent the night with the jitters and major paranoia and feeling very sick. I couldn't sleep for 24 hours. The effects were supposed to last for six. Turns out I'm extremely sensitive to caffeine! If you're going to try it I'd do what you suggest and start with a portion of the pill only.