It could be that they are triggered by being introduced to things that are outside of your comfort level. I'm assuming that thinking about the future, school, peer pressures, dating and a lot of other things-- zits, clothes, being cool or not would be on the mind of someone your age. This is the perfect time to get into the idea of being emotionally resilient-- being able to maintain an even mental condition, and swing with the punches.
caffeine increases panic attacks. Any soda coffee or tea (except herbal tea) should be eliminated since they might be the cause, and also try chamomile tea. Valerian is wonderful for taming panic, but if you take too much you begin to smell, and valerian does not smell very good-- sort of dirty sock awful.
I'm the type who says don't go to a shrink or doctor unless it is absolutely necessary, because in my opinion, they are all about getting a patient hooked on drugs. If it is "That bad" you may not have a choice, but once per month does not seem like anything that you can't live through. Just try to find out if there is a cause to it-- like try to find out what set you off, then, next time that stimulus sets you off again you may be better to deal with it. For example, you could have been thinking about finding a job, or going to college without realizing it.
A crock pot, and rice cooker could be good inclusions to your kitchen though, so would an electric fry-pan or Wok You can find these things cheap at any goodwill. I went though all winter without a stove, and my sister went for 5 years without one.
Just my 2 cents worth.