When you say pulsing, do you mean that your upper eyelid or bottom of your eye (under the lashes) is twitching? If so, this is normal and is usually caused by stress although the reason for it is unknown. I've had this for a few days and my husband had it for almost a month. It usually goes away on its own. You can call the eye doctor and make an appointment but he/she will probably tell you the same thing and there is no instant cure for it. Try reducing your stress level if possible, using the computer less or resting your eyes every once in a while. Getting enough sleep and avoidng long intervals of watching TV or the computer screen can also help a bit.
In rare cases twitching can be a sign of neurological problems but this is so rare that I wouldn't even worry about it especially if the pulsing or twitching is minor (in other words, it's not violently causing your eye to open and shut on its own). You might be able to notice the twitching or pulse if really look at your eye in the mirror. Although annoying, it's probably nothing. Go to your general doctor or an eye doctor to confirm this.
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