Immediately Strattera side effects

So I was prescribed Strattera (40mg) for my inattentive ADHD a few days ago. I heard it can cause nausea and sleepiness so I decided to take it in the evening. I have not eaten a lot today and had a little bit of caffeine so maybe this is why, but it’s been about an hour since I took it and I feel very strange. My heart rate is normal but I feel jittery and restless and can’t relax. Does this go away? Is this something to be concerned about? I know it takes time to kick in, but from my understanding because it’s not a stimulant like Adderall it doesn’t usually have side effects so soon. I would say it’s placebo except it feels very real to me tbh.