Why have I been hyperventilating for months but do not have anxiety; accompanied by palpitations, pleurisy, and a high pulse rate. I'm 23 w/ sle?

Tachycardia with SLE. As you may know, sle affects multiple organs. It can cause pleurisy as a result of pericarditis, myocarditis, endocarditis, pleural inflammation, pleural effusion, interstitial lung diease, and even pulmonary embolism. As high pulse rate could possibly mean something potentially life threatening like pulmonary embolism, I would consider going to er if you are not followed by your doctors closely.