Sertraline & lethargy, how long?

So, after Citalopram didn't work for me, I got put onto 50mg of Sertraline. 

For the first week or so, I was very tired, but that subsided and I soon started to feel more positive.

After maybe a couple more months, it started to lose effect and about a month ago, my dosage was increrased to 100mg.

So far, I still remain very tired and have little energy, I'm also comfort eating a lot and my weight has gone up a bit.

Should this still settle down soon, or do I need another visit to the GP?

Side effects can take time to go, your probably a bit unlucky at the moment with the increase, perhaps give it a bit more time and if you see no improvement have another GP visit, alternatively go see your GP as soon as and discuss your concerns.

I wish you well.

Neil 

Think you need to consult with your doctor.

Good luck.

I'd have thought after a month particularly on an increased does it would have settled down. I would go back to your GP.

Been back to the GP.

He thinks it's pretty much down to me not being busy/down at work, but is running some blood tests on Monday to be sure.

I've noticed myself that lethargy seems to increase when I get stressed. I'm on 150mg at the moment which is allowing me to function. However, I've had a stressful week this week and have felt more tired.