Firstly, any monitor's brightness is controllable by you, the consumer. If you want to turn the brightness down it's either can done from a Function Key (F some number) via setting it at your keyboard or look in your user manual.
Be awawe that you probably won't get a queazy feeling due to too much brightness. Most likely you have a problem from some sort of flicker from the display. If the effect you're getting is a slow-ish wavy rippling that ripples vertically and it's making you seasick, that is A/C "hum" leaking from a bad power supply filter. However, another type of visual problem is 'flicker'.
One thing that could be checked is the monitor refresh frequency rate. Setting too low and it could cause a visual problem. The video card controls the refresh rate of the display. If it's too low...say below 60 cycles (rare), it could be a little offputting. 72HZ is a better rate (but I digress):
To change your display settings
Open Display Properties in Control Panel.
Click the Settings tab.
If you are using multiple display support, click the icon for the monitor whose settings you want to change.
If you are not in safe mode, try each of the following steps. (In safe mode, these settings are already set to minimum values.)
In Color quality, click a lower setting.
Reduce the size of your desktop by moving the Screen Resolution slider to the left.
Click Advanced, and check the Adapter and Monitor tabs for a Refresh Frequency setting. If this setting is available, change to a loweror higher refresh rate or use the default setting for the adapter.
After you make your changes, or to accept the safe mode settings, click OK.
Restart your computer if you are prompted to do so. Do not select Safe Mode.
My final advice if none of this make you feel comfy doing...is to bring the laptop back where you bought it..and either try to get an exchange it or have them adjust the probem out.