Sertraline - Starting 50 mg after 6 weeks Feel very tired and as though it’s making me depressed.

Hi!
As I recall you've been on a lower dose... did you have side effects on that dose? With the higher dose, if you're having side effects now, they shouldn't last more than a week or so. It's normal after a dosage increase and fatigue and increased depression is common.
Try to bear with it for a few more days... the effects should fade day by day. If they should happen to persist let your doctor know and be sure they approve of any dose change.
Take care,
WC