Massaging the scalenes often irritates them and causes them to get tighter. Try massaging them with oil to prevent overdoing it, castor oil, or massage oil.

Ultrasound guided botox injections is the only thing that has relaxed my scalenes in ten years. This along with physical therapy, possibly botox in the pec minor as well since you do computer work that likely does this. Try calling vascular surgeons ordain specialists to find out who can do the ultrasound guided botox or fluoriscope guided botox.

You could have dry needling in the traps and pec minor. This will temporarily relax these muscles, but it will come back most likely because your scalenes are tight.

Some people swear by acupuncture, I've never tried it.