It certainly sounds as though you may be in the early stages of adrenal fatigue. You should indeed get some tests done, but just be aware that just because the doctor says they may come back within the normal range does not mean that you are not suffering from adrenal fatigue. Also by going to the doctors you may also be prescribed meds which will only hinder the healing process.
It is interesting you noticed your face as I saw changes in mine about 12months before I was hospitalised with extreme adrenal exhaustion, but I thought it was just that I was aging- as I was 30 unlike yourself who is only 19. It is actually a good thing that you have noticed all of these symptoms as they do equate to an imbalance in your body. It could become extreme and chronic if you do not get a handle on it. I suggest seeing a herbalist. It sounds like you have already been gathering allot of information which is important. You also need to take a serious look at your diet (first) the candida points to that, try more alkaline foods (versus acidic) and remember to question everything and trust and listen to YOUR body (which it sounds like you are)! Your symptoms may sound trivial to someone else but don't wait until they become more serious. Saying that..... The adrenals are greatly affected by stress so if you can get a handle on the worry, try to. Of course figuring out why you are not experiencing optimum health at 19 will help in that regard! Goodluck!