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.