I'm a 17 year old girl and I've had some weird symptoms. First of all, I've lost around 15 pounds in the last 5 months without trying. I was at a healthy weight before and now I'm pretty underweight. I just brushed it off though and just assumed that I have an overly fast metabolism. In the past 3 months or so I've been getting this aching pain mostly in my elbows, knees, and other parts of my arms and legs, and I know it's probably not because I'm growing, because I'm not and haven't since I was 12 or 13. At around the same time, I've been getting short of breath way too easily. When I'm not moving around my lungs still feel tight and I even get out of breath by drinking, eating, and talking. On top of that I also feel exhausted 100% of the time and it makes it difficult to stay alert. Oh and I'm not sure if this matters but I'll include it anyway just in case: A few weeks ago I had this rash that looked like a bunch of red spots on my stomach and I've been getting more headaches than normal for me. So what do you think could be the problem? Shoud I go to a doctor? I didn't want to go to the doctor in the first place because I would probably seem too paranoid.