Generally curtains are not all that high tech; DIY sewing of a curtain is not too hard for someone even a little skilled at that sort of thing.
I've been thinking of replacing many of the slide tracks for curtains in my motorhome (which are the style where little C-shaped plastic clips attempt to slide on a T shaped plastic track) with Ikea Kvartal tracks. The Ikea tracks are aluminum extrusions with little wheeled carriers that slide through them. The usual Ikea ceiling mount hangs down an inch or so (and the extrusion itself is about an inch in height), but I think I can attach them to the ceiling directly with Teks lath screws, sneaking the screwdriver through some carefully drilled holes in the interior web of the aluminum extrusion. If all goes well, this should make for much more freely operating curtains. Depending on what your problems are and what the exact layout of the curtain track is, this may be a reasonable solution for you as well. (Ikea does have right angle curved track pieces available.)
You probably will have more help if you get a moderator to move this to some other more relevant category.
