Overcoming HUGE LOSSES (lossing your capital)

I used camel archers with full Honor NQ mod. This mod when you have full Honor gives you Science, Gold and culture for enemy defeated.

The most important way to counter you loss to your capital are these 2 points:
-1) Population Loss. I recommend building hospitals or sending food to your capital
-2) Build Universities as soon as possible (if it was lost when you lost your city)
-3) Fill out Rationalism
-4) Scholastisism in Patronage skill tree also grants science if you are allied with city states. This is helpful because with honor you will have a lot of Gold and you can gift city states to be your ally.

I managed to win scientific victory on immortal despite losing my capital earlier so it is possible

-1) Finishing Honor Gives Science, Culture and Gold. Science for every enemy defeated max 30 per soldier.

-2) Capturing an enemy city who is technologically superior to you results in you getting a FREE technology! Therefore you can catch up