Hi,
The artificial tears you have been given are unlikely to solve your vision problems. In some cases a dry cornea can cause vision problems and fake tears help but It sounds like you have dry eye, which will cause itchy sore hot eyes.
Try a hot towel over you eyes for 10 minutes, twice a day for a few weeks. This will help clear out any blockages.
You can also try boiling water, let it cool, a drop of baby shampoo in a glass, and a cotton bud. Clean your lids with the cotton bud.
In terms of blurred vision your lens inside your eye can swell up and you will struggle to focus if your sugars are going a bit haywire. Better control should improve it but if your really struggling a check again may be a good idea just incase of other problems.