Diseases from a millennium ago weren't much different than today. You've immunities from shit that people died in droves back then. You're biggest concern would be infection from cuts (boil water before cleaning) and tetanus.
If you know how to make a fire with nothing more than available wood branches then you've a better than the crappy average than some here have. (Find flint. That stone isn't for making said fire. It flakes easily enough to sharpen. It'll form one of your first tools, following crude weapons)