This can feel like a genuinely intimidating medication to start, given how polarized the opinions around it get and how life-changing it can feel. So of course nerves and anxiety showed up! Completely normal, and you're definitely not alone in that. Solid move being brave enough to actually begin.
Hard to tell sometimes whether a strange sensation is pure anxiety, a little bit medication mixed with anxiety, or purely the medication itself. My guess leans toward mostly anxiety, since we're all hyperaware of our bodies looking for any difference. Try finding something to distract yourself with and definitely still show up to work. Keep in mind most people barely notice anything at the lowest amount, so nothing much might register at first. My own first week had zero side effects or appetite change, honestly would've doubted the medication even got administered if I hadn't watched it happen. Turned out fairly anticlimactic after all that buildup. Just try to keep going about your day to day, treat this like a long haul rather than a sprint, patience is key.