There could be a couple of possibilities.
One is that you could be experiencing floaters. This is the gel in the eye that breaks up into pieces as we age. It can float in front of your vision and blur the vision. It is usually most seen against a bright background.
You could be experience after cataract scar tissue also. Often, after surgery, a scar tissue starts to slowly grow behind your implants. This will eventually start to affect the vision. If so, it would need a simple in-office laser treatment to clear away.
Your vision could also come and go with allergies, sinuses, and dry eyes.
It sounds like you need to see your eye doctor again; although doesn't sound urgent to me.