Even now, more than two weeks after being hit on the helmet by a pitch and two days since being cleared to resume baseball activities, Red Sox shortstop Stephen Drew continues to experience the residual symptoms of his first career concussion.

"That slight, you can call it fogginess, the little spin feel going on every now and then," Drew said today after another off-field workout at JetBlue Park. "That's just what I've got to work through it. It's come a long way. It's something, when I started this, I was thinking two or three days, and before too long I was thinking, man, what is going on here? Luckily, like Doc said, it's a lot better scenario where I'm at than where I could have been. Now it's just dealing with this, trying to get the final touches on it. I'll know when I feel right. I know that's the biggest key. When I do, then I'll move forward."

Last weekend, Drew passed the MLB-mandated concussion tests required before a player returns to the field. But because the symptoms have persisted, he traveled to meet Wednesday with Dr. Mickey Collins, a concussion specialist at the University of Pittsburgh Medical Center. The trip was as much for Drew's peace of mind as anything else. Collins is an expert in the field of concussions, dealing with about 18,000 cases per year, according to Drew.

"Never knew what a concussion really was," Drew said. "Going through it now, it ain't no fun. You're kind of in limbo out there because you can't really do nothing and try to make it better. It just takes time. There are things I can do now with training my eyes just to get everything coordinated back hopefully sooner than later. At the start, it was a lot of dizziness and unbalanced feeling, very tired. Going through that and where I'm at now, the tiredness is going. Just getting everything back in sync. Still, the symptoms are there a little. Just trying to knock that out as quick as possible."