I've been taking the medication for three weeks now, 500 mg (I th...

I've been taking the medication for three weeks now, 500 mg (I think) twice a day. I've been suffering from a constant gurgling in my stomach, as if from a stomach virus. I'm also experiencing joint pain and some tingling in my fingers and hands, also some pain in toes/feet. Initially I suspected the joint pain could be the onset of arthritis, since it runs in my family. But then I remembered I've been taking this medication for quite a while now; I'm wondering if joint pain could be a side effect?