I ended up going to a specialist after my recurrents - he sent me for a variety of tests (heaps!!!) and it turned out to be a blood clotting disorder that was rare and I hadnt been tested for before. He was the first one to put the puliminary embolism a few years earlier and the recurrent MC's together and send me for blood tests based on clotting factors.
After that, I went on Cartia, got pregnant, went on clexane injections daily and now have the most wonderful 4 month old daughter after 5 years of torture. I am still on cartia now and I thank that specialist as without that info I could have had another clot which may have been fatal - he saved my life and gave me the gift of life.....
anyway - I recommend seeking help from as many different places as possible. If you don't like the answers from one place - try someone else and just keep trying!!!
Best of luck and I really hope you find your answers