I need some help!

As some of you may know,I started with Verapamil on the 25th of April 2012.It has been a bit of a bumpy ride,but started feeling much better when I reached 120mg.I then proceeded to try 240mg,but never reached that.I developed very painfull/stiff neck muscles and weaned myself from the medication.I have now been off for about two weeks and my neck is better but not 100% yet.I am confident that the Verapamil made a differnce .What the hell is going on?