Low sodium level symptoms and conditions

I have been on Diovan 160 for two years. Have put on 10 - 12 lbs. Have developed low sodium levels, muscle pain and slightly elevated blood sugar levels. Is low sodium level a possible side effect of taking Diovan?

My Mother's physician wants to prescribe Maxide.
However, my mother was recently hospitalized due to low sodium level of 119, caused by the HCTZ that was included with her blood pressure RX of Lisinopril. The HCTZ helped lower her blood pressure. However, she has been experiencing leg and feet pain and cramping for four months. Recently had an onset of a terrible headache and vomitting whereby she ended up in the ER. After not having the HCTZ with her blood pressure RX she had extreme swelling in her feet, ankles and lower leg area and her blood pressure has elevated. She had an EMG and now has neuropathy. Hospital physician instructions: Do not take HCTZ. Do not think Maxide is the thing for Mom to take either. Any recommendations?