I layed down and rested because i felt dizzy then i took my pulse twice and average 126 bpm....????

Your tachycardia may: be a response to something else, such as anxiety, withdrawal of medications (or substances), or it may be a native arrhythmia (abnormal rhythm of the heart). You may pass out. If this persists or comes in waves, I would get myself to a healthcare provider as soon as possible for proper examination and diagnosis. These are the types of condition that requires a thorough workup by the physicia

Rapid: Normal heart rate is 60-100 bpm. Please see a physician for this tachycardia evaluation- ASAP, especially with your symptoms, I would advise ER or UC evaluation- NOW!