I don't think it's unusual for blood pressure to go up when pain levels go up because pain increases stress, which in turn can cause blood pressure to rise.  And I know it's not unsusual to hold your breath when you're in pain.  I think we all do it – it's a natural reaction.  I think subconsiously we think if we hold our breath, the pain will stop.  Unfortunately, the opposite is true.  Holding our breath can actually make our pain worse.  Here's an article that can help you learn how to improve your breathing:  The Importance of Breathing Properly

I can also really relate to your frustration with not being able to make plans to go out.  I, too, was a super active person and now I rarely go out.  I do try to force myself to go out occasionally, though, because I know I need that face-to-face interaction with people.  It's easy to become depressed when we're isolated.

Have you talked with your doctor about medication to help you sleep?  As I'm sure you know, getting a good night's sleep is so important for your body to restore and regenerate itself. 

The other things you're doing, like aquatic therapy and meditation, are very good.  You might want to look into some other therapy options like massage therapy, acupuncture, yoga or biofeedback.