Dull, painful ache in shoulder blade going to neck. Tried epsom salt, volatren and ibuprofen. What else can I do? Doesnt seem to be better after day 3

Get to your Doctor. There are so many possibilites here that there is not enough room to list them. Some of the possibilites can be quite serious. Besides a simple muscle strain it could be your gallbladder, heart, lungs, blood vessel dissection/anerysm, neck disc or nerve root just to name off a few. To help figure this out get in to your doctor.
Heat. You could try heat, low for 20'. Massage might help. If no relief see a doctor who can make a definitive dx. Careful stretching also is helpful. You might need a muscle relaxant.