I think you answered your own question, your doctor is not familiar with treatment protocols. Do you have any possibility of getting referred to a specialist, even if you must travel?

If I was in your situation, what I would do is to find some of the references for using saline, take them to my doctors and ask for a prescription if they will give one, or are least their agreement for you to try it on your own. If health care is scarce, the last thing I would want to do is anger the doc so they fired me as a patient.

I'm working from my phone, so limited ability to find my links.When I try I seem to lose what I just typed. So I'll post this then try to find the link and post it.

Here is the current European protocol:
https://publications.ersnet.org/content/erj/early/2019/04/05/1399300302143-2018
Sorry I can't get my other links to work.