What is causing me to break out so bad since going away to college?

Okay, so I'm a 25 year old woman and just transferred to UMass Amherst. I have always had pretty clear skin except for the occasional breakout.I breakout mostly on my forehead, cheeks, chin, and sides of my nose. I have really red irritated blotchy oily and dry skin. I'd like to know if anyone has experienced something similar and has advice.

. It could be;

1) adult acne or stress, but it only started two weeks after coming here.

2) The water is soft here and I'm used to harder water

3) I lived on the cape which is below sea level to UMass which is in the mountains

4) It is also extremely dry here and where I used to live it was humid

5) my dorm is ridiculously warm and I have to keep the window open or it turns into a sauna

6) Also my mini fridge kind of has a mold smell that leaks into anything put into it and for awhile that's all I've been drinking water out of

Things I've tried:

1) a humidifier

3) Dr Bronners Tea tree Castille soap

4) coconut oil

5) not exercising

6) eating mostly vegetarian

7)Tea Tree oil

8) not wearing makeup

9) using cold water at the end of cleansing

10) washing my sheets and pillow cases/towels every four days

The only thing that seemed to help was going back home to visit my family I was only there for a day and a half but my acne and redness went from everywhere to barely there. However just one day after returning it started coming back. And now its just as bad as before.