I downloaded Duke Patricks combat archery mod, and when I equipped any bow, I noticed that my fatigue had gone from 200 to just over 60000. Originally I thought it was the mod doing this, like a bug or something, but when I disabled the mod it still happens.. It doesn't happen on any other characters, just this one.

Has anyone else had this problem?

Edit: Way earlier saves don't have the problem either.

Wow... I want that to happen to me, but with Blunt weapons. Swinging around heavy Silver/Steel stuff makes my Fatigue vanish vanish quickly

Do you use any combat mods, like Deadly Reflex? Any mods that alter fatigue in any way? And does it happen with all bows? Do you get any spell effect, or does it only change Fatigue? (not Agility, no fortify effects, etc)

What level is your marksman skill?

Try adjusting this line in the DP archery ini:
set aaDPSCABOWSWAYquest.DrawBowFatigueMod to .005

Does this happen when you deactivate the DP mod?

I'm at meetings all morning - may get back to you later today or tonight. Those are just my first thoughts.

That doesn't mean it's not the mod that caused it. The effect could be stored in your save game, and even removing the mod won't get rid of it. It does happen sometimes.