Is it normal to be lightheaded and dizzy after having a pacemaker installed?

You may be having trouble with the pulse rate. If it is low, not enough blood is getting to the brain. It should be above 50+ beats per minute. Also check the amount of oxygen in the blood. If you are at home, a small pulse/oxy can be bought and will give you both. Of course, the blood pressure could be lower than you are use to. Check on:

• oxygen saturation
• pulse rate
• blood pressure

to be sure that they are in the normal range and talk to the doctor.