I've taken it. I'm sensitive to meds (and pretty aware of bodily sensations). I've found with starting any SSRI (or SNRI), the first couple days, it was almost like I could feel the extra serotonin swirling in my body. I'm not sure how to explain it. But made me feel a bit anxious. For sertraline (and Paxil), it subsided in a few days, and I ended up on it fairly long-term (a few years) on a couple occasions. With Prozac, it continued, but I've read that's a particularly "activating" med.

So you could in fact be feeling something from it. If it's at all tolerable, I'd give it a couple weeks to see if the side effects fade. Hope it helps!