Morning everyone 
nat no I don't think I really had any side effects going from 25 to 50, although I took 25 for a week before increasing. And yes, obsessive thoughts are one of many symptoms of anxiety and depression, so the tablets should definitely help. I also take mine in the morning btw.
closed I was also thinking it sounds like you could have SAD - maybe it would be worth speaking to your gp about it - I've heard of some people having their dose increased or only taking ads from October to March to help. I also get angry with myself that I have no reason to feel like this. I have a lovely H and family, nice home, etc.... But anxiety & depression can happen for all sorts of reasons, chemical and hormonal ones as well as anything else, and it's something that's sometimes just out of your control.
will three weeks is still early days as others have said - and ads can definitely bring feelings to the surface before you start to feel better. It wouldn't hurt to check with your gp - I suppose it depends on how much wires you're feeling. If you're just feeling low then you could just ride it out a bit longer, but if you're feeling worse than that then definitely make that appointment...
minnie I had a horribly dry mouth for the first few weeks, almost like my tongue was stuck to the roof of my mouth! I got in the habit of keeping some mints or boiled sweets in my bag to help and kept sipping water as well. I still get that a little bit but nothing like as bad as it was.