I am 58 years old, have been hurting in my arms for weeks and getting weaker. I have been going weekly to the chiropractor for numbness and tingling in my fingers along with having a crick in my back . That is somewhat better but I feel as though my bones are bruised and I hurt all the time now. It actually hurts to lift a water pitcher or fold a towel. I take Lasix 20 mg but also take potassium 20 mEq a day. Can low potassium cause overall weakness and pain? I take metoprolol 75 mg twice a day (increased 2 months ago from 50 mg twice a day) to control my heart rate. My rate is about 95 right (115 this a.m.) with a normal BP. These are the only medicine changes made in the last 2 months. Another issue is rapid weight gain. I have gained over 10 pounds in a month mostly in my abdomen. Last but not least I have acute and chronic pyelonephritis with an atrophied kidney but function was good when last checked.