How Long Does It Take For The Side Effects To

How long does it take for the side effects to start? After the first month I started having sharp pain in my right side of back, stabbing all he way thru. I have been on it 6 months and this pain has gotten unbearable. Have seen back doctor and spent last night n ER thinking I had a kidney stone. Nothing showed up but pain is worse I have ever had. Could it be the boniva?