Pulmonary Hypertension-Sleep Apnea

I had an echo about a year ago in which all was fine except the right systolic ventricular pressure was estimated as 47. The cardiologist felt this was due to weight (morbidly obese of 290 lbs) and an echo 120 years prior at age 35 and a lower weight had been normal. I was having episodes of feeling I was going to pass out sao he did the echo. I also was referred to a pulmonary dr and my lung function and oxygen level from arterial gas stick was normal. The echo was repeated 6 months later and the rsvp was 57 to 60 estimated. The cardiologist still felt it was no significant change in severity and referred me for sleep study. I was found to have sleep apnea and started cpap in March of this year. My questions are:

1. Could OSA cause my rsvp to be this high?
2. Am I in immediate danger if the pressure has remained at 57/60?
3. How long before the cpap therapy should make some difference in the rsvp number?
4. If sleep apnea is the cause of the RSVP, will cpap reverse it or keep it from getting worse, coupled with some weight loss. I do feel better since starting cpap but not sure if this means I am better.

My next echo is currently scheduled for July. Of course I am concerned based on what I have read about PH and would like any answers you culd give me, along with treatment suggestions.