have been on diovan for about 3 years. taking 80 mg. twice a day....

have been on diovan for about 3 years. taking 80 mg. twice a day. have gained weight. then in oct. 2007, my doctor upped my dose to an extra 40 mg. i had noticed side effects when i first started the diovan, such as back pain, dizziness, weight gain, diarrhea. then when my dose was increased, i now have knee pain, muscle pain all over, weakness in legs, more fatigue, no energy. i have to force myself to do what i need to do, because my body is so tired. the thing that scares me the most is the weakness. not just feeling tired, but muscle weakness. has anyone experienced muscle weakness while on diovan? thanks for any response.