Maurten caffeine… too much?

I drink plenty of coffee daily, including a big cup before runs, and am very accustomed to using a few caffeinated gels during a run. Yesterday during a half marathon where I would normally have 2 to 3 gels with 20 to 40 mg of caffeine each, I actually took a Maurten 100 mg caffeine (in addition to earlier Gu with 35mg I think). So I got more caffeine than usual. I am also accustomed to regular Maurten and the Gu… so the only “new” thing on race day was the amount of caffeine being somewhat higher (though still less than adding extra cup of coffee).

About half an hour after the Maurten I started feeling bad, almost more of a worry of vomiting, but I know that could be the feeling when your heart is pounding too much. I was definitely not running harder or faster than usual. I don’t really know what was happening, so I’m asking is 100 mg caffeine (as a quick dose) too much?