What can this noise be in my chest?

I’ve had this for a while, but when I go to the physicians for my check-ups they don't hear it, It's only when i lay down in bed i hear this whistling noise like a few times then stops and then happens again, I'm overweight I weight 260 I'm losing weight slowly cause I'm on a diet, and I Drink no sodas I used to be a heavy soda drinker, now I love powerade and V8 splash and milk, and juice or tea, and one soda now and then, I'm 5'7, I'm going to a genetics test and the first test was last Monday and they checked my heart with that camera machine, and sticky things they stick on you and the results came back has normal fine blood flow, and good heart, witch It was good to hear, also, I just don't get that noise though, I do have low thyroid to. and Allegories bad.

I'm 22yrs old.