Do i need Doctors permission to travel?

It's not so much permission that you may need as advice and warnings on any health concerns specific to the area you're traveling to. That is, ask your doctor if he or she knows of any frequent illnesses reported by travelers to that region. You may actually need a vaccine or prescription before eating indigenous species of flora or fauna or drinking the water, as natives of the region may have built up immunities by living there that you haven't.