It almost sounds to me, if it is happenig repeatedly on a set schedule, that you may be in a dream state, one you can't remember, and it is causing you to "shoot" awake. This happen often to some people, and usually stops on it's own. I wouldn't worry about insomnia, or ask for medication yet, as you said that it has only been happening for a week or so. your body and mind will probably adjust itself, and correct the problem.
If you have any daytime symptoms of your sleep not being restorative, you may need to see a sleep doctor. (Some symptoms might be daytime sleepiness, lack of energy, mental fogginess, not feeling rested on waking.) Many people wake up a few times each night without apparent adverse affect. But you do want to be sure there is no underlying sleep disorder causing your wakeups. There are many sleep disorders, but a couple common ones are sleep apnea and limb movements. If your sleep patterns are problematic, I would want to first rule out a sleep disorder before considering medication. Just my opinion.