It sounds like you have a lot of difficulty at the moment and I am so sorry to hear that.
Yes blood clots in the lungs can cause pleuritic chest pain, but they are not the norm. Pleurisy is most commonly caused by some form of inflammation of the lungs and the surrounding tissues which is what a pneumonia does.
However, in your case, it does sound like there is a lot of things to consider in your case and it would not be right to reduce your symptoms to what would fit in a medical trivia.
I wish you speedy recovery!
Thank you! I sure hope I'm back to full health soon too 😄
rooting for you strongly