I am on Savella for over 3 weeks, the side effects of hot flushes and perspiring are not easing up. (still on 25mg. once daily) Do the side effects get better?? I don't want to go up on dosage yet due to fast heart rate (the other morning it was 140) but since I have tried Lyrica, & Cymbalta and Elavil with no pain relief I want to try and stick this out. (the fogginess is better but pain is still challenging)