Only you can decide what is prudent or not. It is reasonable to follow your doctor's advice as well as it would be reasonable to seek a second opinion. Whatever will give you peace of mind is the prudent thing to do. Good luck.
chele68,
Thanks for the post.
Q:"Is this prudent or should I insist on seeing PH specialist and/or confirming the results with a heart catheter?"
I don't routinely send someone with the numbers you listed to a PH specialist, nor do I routinely confirm the numbers with a right heart cath. But remember, I have never seen you specifically, so I can't comment on the "prudence" of this decision in your particular case.
Talk to your rheumatologist, he/she may have specific opinions of what to do or not to do with the methotrexate therapy.
Hope that helps.