I had 3 months of severe breathlessness, got to the stage I could only walk up 3 stairs at a time before needing to sit down and rest. I visited my GP 9 times in that period and she kept sending me away saying I was "overdoing it and needed to rest". I had to sleep sitting up as I couldn't breathe laying flat. I was 32 and convinced my children would wake up and find me dead one day.
One morning I had this feeling of impending doom, that I just couldn't shake, so took myself off to A&E. I was in the CT scanner within 15 minutes of arriving and when I asked the radiographer if I had a blood clot, he said "A blood clot? You're riddled with them - we stopped counting when we got to 30!"
I had a week in hospital on blood thinners and took RIvaoxiban for 6 months. When I stopped, the PEs recurred within a week so I went onto Warfarin. After 6 months they stopped that and the PEs recurred again after a week! I'm now on lifelong Apixaban.
Unfortunately for me, as the original PEs took so long to be diagnosed, I had a lot of lung death, so now have a hugely reduced lung capacity and get breathless even when just talking. It's so bad that I'm now registered disabled and on PIP, unable to work.
Most people seem to recover pretty well with not too many long lasting ill effects, I have been incredibly unlucky - and had a particularly incompetent GP!