"They gave me some medicine and I feel a lot better," Dominguez said. "I didn't really know what it was. I had never had one before. I got very light-headed and dizzy for no reason. When I looked around I had a lot of pressure in my head."
Astros manager Bo Porter said they're shooting for Dominguez to return to the lineup in some capacity on Friday.
"He's just not back at full strength," Porter said. "They gave him an I.V. yesterday. It's just one of those things that has to take its course. The training staff is doing everything it can to just try and get his energy level up, and hopefully by tomorrow he should be at least well enough to be able to give it a go."
Jeff Kirshman is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.