I have pulmonary fibrosis (not idiopathic but caused by an autoimmune disease). Whilst the Brompton were investigating the PF about a year ago, they discovered that I also had pulmonary hypertension (as described by Gidge). The artery on the right side between heart and lung has narrowed (possibly scarred-but certainly due to the same immune system condition). It causes pressure in the artery and makes me even more breathless and I have started to retain water.I was passed over to their specialist pulmonary hypertension team for tests and treatment. PH is a rare disease, as is PF and Royal Brompton is one of the only 9 specialist centres in the country for the treatment of PH. They are as thorough and, if possible, even more supportive than the PF team. Anyway I am now being treated with a drug called sildenafil which helps to relax the artery and improve blood flow. Also have diuretics. Although I am still struggling with breathing , particularly when moving about - the echocardiograms I have had every 3 months show that the PH situation has improved from when I first started taking the sildenafil.
Perhaps you may have something similar. None of the medics involved seemed at all surprised that I had developed PH - it seemed as if it was quite expected that it might happen.
As with PF, there is no cure but there are now a few treatments that can be tried to improve or holt the condition to some extent.
I do hope you have some positive news when you go for tests.