can you try and work out where the weight is coming from? you say you're stressed, are you binging/comfort eating as a result of stress? are you eating junk in the college cafeteria where you used to bring a packed lunch? etc... if you identify the problem you should be able to fix it and find a happy middle ground, remember your weight hasn't flown out of control, it's half a stone, probably other people barely notice it, if at all