Thank you all for your responses which are very helpful. I'm trying to go slow and take it at night and see if the weakness/fatigue subsides. It's not constant and when it's not present I feel like my mood has already improved, so I'm hopeful for now.

Interesting how medication effects people so differently. I aske my psychiatrist how he chooses which antidepressants to prescribe for patients and he told me side effects, are the deciding factor.