It's probably more of a spasm than a "pulse" perse. Try massaging the area; hitting it will only aggravate whatever set it off in the first place. It should be gone by tomorrow... clearly you aren't accustomed to physical discomfort or such a thing would never bother you to the point that you want to "BREAK" it.
Just try to relax your arm. Massage the affected area for a few minutes, then wrap a washcloth with warm-hot water around your elbow for about one-half hour. Be sure to disk the cloth with warm water as necessary. If none of the preceding helps, and the spasm persists to the next day, you may want to consult your physician or a pharmacist. For something this minor, you may want to stick with more natural remedies such vitamins and herbs (should the issue call for it).