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.
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.