Another dying Rosemary

[ameno]

I have kept it out of the cold, even bought it into the house this last few weeks and kept in a window that gets some sun and still it just gets smaller and smaller while shedding.

I imagine that's the problem.
Rosemary don't like winter wet or excessive cold, but they are still perfectly hardy, and prefer to be cool over the winter. If you try to keep in a warm home over winter it will likely die.
Next time, just pot your rosemary into a larger pot of well-drained, gritty compost, and just leave it outside over winter. If it rains a lot where you are, try to rig up a roof of some kind, maybe, but it shouldn't need more than that.
I mean, where I am (south Somerset) you just stick rosemary in the ground and it grows just fine (even on my clay soil). It's probably a bit milder over winter than it is where you are, but it's probably also a fair bit wetter.

I also feel like trying to keep it in such a small pot may not have been a good idea. Rosemary grow to a decent size, and they like to grow, so a pot that small won't last it long. If you buy a plant in a pot that size, it probably needs repotting straight away.

[Marb67]

Why oh why do I have such bad luck with herbs, Rosemary in particular ? I look after them as advised on the label, not overwatering etc and still they just shed their leaves and die. This Sudbury Blue I purchased in Spring was lovely and bushy. I have kept it out of the cold, even bought it into the house this last few weeks and kept in a window that gets some sun and still it just gets smaller and smaller while shedding. It just seems I can't grow anything.