What is the effects of taking diclofenac and mefenamic acid on mild/moderate pulmonary hypertension? What are contraindicated meds in this case also?

Unlikely but possibl. This has been reported to the FDA. Here is a website on this. http://factmed.com/study-DICLOFENAC-causing-PULMONARY%20HYPERTENSION.php.

It would be best to discuss this with your physician.