Be proactive when it comes to your health. Plan pre-travel checkups and assure your health insurance is valid abroad. You should see a physician one month before your trip. This way, you can get the needed vaccines and medication for travel and you can ask for country specific advice.

Make sure your prescriptions are filled and that you have enough medication to last you throughout your entire trip. You should also check if your medication/prescription is available in your host country.
Discuss any chronic illness or disabilities with your doctor to find how you can best manage them on your trip abroad.