I am a 37 year old female, normal weight, history of allergic asthma, and diagnosis of mixed connective disease. Recently I have experienced SOB and dyspnea while working out. I had started working with a new trainer and contributed it to that, but after about 6 weeks there was no improvement, and my trainer suggested I see my Pulmonologist . CPET was ordered. Results mildly low CO2 at peak, decreased O2pulse at peak, and low VE max. No EKG abnormalities. He ordered a new ECHO and referral to cardiologist. Last ECHO, a year ago, showed LAD of 4.2, mild diastolic dysfunction, RVSP of 33, and intra atrial septum aneurism. Pulmonologist told me I needed to push this, given new symptoms and MCTD. My mother really wants me to look hard for a cardiologist and inquire about a cardiac rehab program. I am not a person who questions doctors, and am worried about looking like a hypochondriac . Is this something I need to push? I don 't want to ignore something that may progress into a bigger issue. Should I be pushing for more aggressive treatment of MCTD or is that in no way related to this. I am not sure what issues are related. I am worried that no one is connecting the dots.