The decision on wiether or not you can enter a country is decided by the embassy of that country when you apply for a visa to visit that country. If you are honest about your medical record and they still give you a visa, then you would be good to go. However I would ask your doctor if it is safe for you to travel with the medical issues you have had.
Yes you can.
what is the cheapest days to fly to Europe
to abroad
yes
I've heard that there are approximately 100,000 cells a fly's brain.
Sita with Ravana
Since these little, or big, pesky insects can find their way into luggage, cockroaches can pretty much fly abroad at any time. There is no set time or month that cockroaches are scheduled to fly unless you have a jar of them and keep them as pets or for experimental reasons. And then you can still fly with them at any time as long as they are sealed.
Mother theresa
yes flies do have a brain though small in size
The standard size of a fly's brain is based on the fruit fly. It has been calculated to five hair breadths across and be two hair breadths long.
mosquito
You can only use a UK drivers licence as proof of identity to fly within the UK. If you want to fly abroad - you will need an internationally recognised passport.