I think I have costo
Possibly relevant info: I'm a student (lots of laptop use), artist (hunched over desk), I workout a lot, and I'm very injury prone in the ligaments and tendons. I've suspected I have EDs for a while. When exercising, I work my whole body and I started a new-ish routine 4 weeks ago. I never stretch and I havent worked my chest for about two weeks, but when I do, I include bench presses and I regularly did dips until 2-3 months ago. I train my abs pretty aggressively about 6 days a week.
A week and a half ago, I suddenly developed shortness of breath. When I inhale, it feels like my lungs are hitting a wall and can't expand any further. Sometimes, I can kind of brute force them and get in a deep inhale, but it still isn't my full capacity and its very uncomfortable. Sometimes, this deeper inhale causes mild pain between my shoulder blades and the center of my chest. It feels like I'm breathing at about 2/3 of my usual lung capacity, and its making it very hard to workout and perform at my job :( This problem persists at all times, but its tolerable if I'm sitting at rest. When I get winded or anxious, I struggle to catch my breath and get dizzy. I haven't fainted, but I almost have. Today, I noticed my ribs are tender below my breasts and sometimes I get deep aches there. My ribs feel incrediby tight, like I'm doing a vacuum exercise for my core and I can't unclench the rib area. Also, I've noticed very quiet crackling and popping sensations along my upper/mid spine when I arch my back or move my shoulders back/forth.
I went to a clinic and they took my vitals, listened to my breathing, and did an EKG. They said they couldn't find anything wrong and I should go to an ER for further testing. They seemed pretty confident it wasn't asthma, but I tried a friend's inhaler anyway and found no relief.
Yesterday, I went to an ER. They took my vitals, listened to my breathing, did an EKG, chest x-ray, and did blood work (including a D-dimer and troponin T panel). No clots, pneumonia, or heart issues. Said my oxygen saturation looked good and my heart and lungs looked healthy. They said I wasn't currently dying, but they didn't know what was wrong and I should see a GP.
I've considered it possibly being an allergy, but people on r/Pulmonology suggested costo. In two weeks, I have a new patient appt with a GP and was going to request a CT scan.