Coughing up blood, especially if more blood than phlegm. It could even be unrelated to the COVID19. I carried on coughing up remnants of COVID phlegm (my pulmonologist refers to it as treacle, I described it as a layer of chewed dark brown toffee surrounded by "normal" yellow phlegm. The frequency of coughing up phlegm has reduced over the year since my lungs were cleared of most of the pneumonia. By the way, the first physiotherapist could not hear it was there using a stethoscope as it was a single layer of "treacle". All that worked was old-style physio "torture" which broke down the layer in my lungs. After 1.5 months of regular physio I had learnt to breathe with my diaphragm instead of my shoulders, my pulse Ox went from 70-91 (even measured 100 once for a brief moment) and I could complete a 5km Park "Walk", using my entire lungs. I still have some areas of atalectasis (basically not working - caused bottom lobes of both lungs to "collapse"), but if I do intense walking (5km) at least 3 times a week, the pain in my back (lung) will hopefully reduce as the entire lung is being exercised. Without exercise, I may end up with fibrosis (hardening) of those areas, and it is well worth avoiding. Ask anyone with COPD.
In terms of treatment, the first issue is psychological, and it takes time to accept that life has to change. I no longer have as much energy and that has reduced my activities. I am studying to get a qualification for something I have a lot of experience in, but have not studied. I am terrified to start working freelance, but will be able to control my work volume. Not working is very tough, and we are learning how to live cheaper and eat simpler as my sister and I (I am staying with her to rent out my house) feed about 12 people as we have several children and young adults staying with us to either go to a suburban school (English medium) and an adult training college in Soweto to complete their Matric. I am very fortunate to have a wonderful sister and fur-children that keep me going. Now that I understand why people struggle at school, I am a much more patient tutor. My heart goes out to all of you who are not so fortunate.

When I came home in February of this year after 5 weeks flat of my back from Covid double pneumonia, I had to learn to walk again, I was on Oxygen, and my body was/is still, so tired I can hardly stand it!!!! I came home with a cough that lasted 3 MONTH'S, 24/7!!!!! It was awful and about drove me crazy!!! I did spit up a little blood one time, but that was it, and I believe it was from coughing so hard!!!! Now i'm not saying this is the answer, but I started taking(swallowing SLOWLY first thing in morning ONE teaspoon of RAW HONEY and got the cough stopped!!!! I don't know that RAW HONEY stopped it but I stopped coughing!!! ❤️

Sounds awful Sephrenia. I have not had issues with coughing up blood thank goodness. And I haven't heard of it yet. Hope they can help you soon.. If it's just a little blood it might be from coughing so much. But if it is mostly blood I have no idea. Hope you are doing better soon