I'm so sorry you're having a difficulty breathing. Along with MG, I also have asthma & hypothyroidism, which makes it more difficult to determine which one is causing the breathing issue. However, though I don't have the aching sensation, I do know that the shortness of breath is as miserable as they come. Sometimes, I feel like I could be having a heart attack, when it's just the asthma & allergies causing pressure. My inhaler & nebulizer work for me. What have you been doing for yourself to compensate? Just to be safe, please be sure to discuss with your physician, if you haven't already. Hope you're doing better soon! Best wishes! - Janice (Myasthenia-Gravis.com Team)