Don't try to "whistle" your breath out, relax your open mouth and let the air be pushed out by contracting your abdomen.
Set aside just five minutes several times a day and you will feel your tension and pain lessen.
Hot showers help, but Epsom salts can pull the tension causing chemicals from your tissues. It is best to do this right before bed.
Commit 10-15 minutes to moving and stretching every major joint.
Be gentle. You want to find the tight tissues and gently encourage them to stretch and release.
Pushing to the point of pain will cause them to tighten further.
Again, work with your breath. When you find a tight spot, go into a stretch slowly and only until you have a good stretch - not to pain.
Inhale and let off the stretch. Exhale and go back into it.
All movements should be slow and controlled. Repeat several times.