My symptoms were fairly mild but I did have:

1. Sweats, accompanied by weakness (feeling like I was going to pass out)

2. Yucky taste in my mouth that I couldn't get rid of

3. Dizziness/nausea

4. Fatigue

The good news, though, is that it was off and on and only lasted for a couple of days. I didn't drink caffeine before, though, so I didn't have to go through any of that withdrawel that a lot of people do. For me, I think it was just sugar detox...and maybe not drinking enough water. Since I've started actually keeping track of my water intake and being more intentional about getting enough it, I havn't had any problems at all (except for the frequent trips to the potty!).