Medication time symptoms and conditions

I am taking 25mg of toprol for SVT/MVP started about 6 months ago. started having mild joint pain while doing yoga, just thought I was getting older (I am 46) joint pain started getting much worse in my hips and spreads down my legs when walking for more than 20-30minutes. I have had breast cancer and am concerned it may be a tumor I am scheduled for a bone scan on Monday but after reading the messages on this site I feel much better that it may not be bone cancer and might be this medication. time will tell.