Returning to the gym, help me get me back in shape?

So I'm coming back from a two month departure from the gym, and I've lost about 10-15lbs of muscle mass due to stress and poor nutrition. I'm 21, I weigh roughly around 200, and am 6'4". I go to the gym between 4-6 times a week. I'd like to gain back the muscle and then add on from there. I don't particularly want to approach this problem through anabolic means but I am looking for supplements that will help me get to where I want to be. Before stopping I felt like I was at a bit of a plateau anyway, so maybe this is the opportunity for me to start a new routine. I am a heavy consumer of protein and the stress and poor nutrition are things of the past. My question is, are there any supplements out there that you would recommend to me for muscle gain that'll help me get to where I want to be? I know the question is vague, but I've tried protein, creatine and so on with little result. I'm looking for strength, muscle, and weight gain. Any help is appreciated. I'd do this on my own but i really don't want to do a "trial and error" test with stuff that could mess up my body, or render me impotent.