I was playing Skyrim today and noticed my weapons were all a few points weaker in damage. I decided to load an old save point from a few days ago and my weapons were at their normal strength. I don't want to have to start from the save point a few days ago, but I really want my weapons to be good again. How do I fix this?

P.S. I've tried curing diseases by getting blessed. It didn't work.

Are you sure you didn't just misread it? I've been using my signature Nord Hero Waraxes for a while now and they havn't decreased in damage.

If you're on PC and used the "showracemenu" console command to change your characters face some enchantments disappear and you'd have to re-equip items to work normally again.

You must have been wearing something with +% weapon damage on it, for instance +20% 1 handed damage. Or you might have used a potion to increase the damage. Or maybe you loaded a different character who had different perks/skills/etc. Weapon damage didn't change by itself.