Talk to Endocrinologist on Chest Tightness And Breathing Issues

I am a hysterectomy patient. last year sy health issues face kr rhi hon endoscopy, Nasoendoscopy, bhi hoi hai all reports are clear,but 5 to 6 months sy ye problem hai k Kuch bhi khaon piyon to chest tightness,or esa feel hota hai body me oxygen level km ho rha ho saans leny me problem ho ab plz guide kren mujhy kon sy specialist sy consult krna chahye .