The training you did is not wasted, it's like money in the bank. Often when someone comes back from injury there much better then ever. As for the pills, some times things go wrong and we use up all our serotonin, hopefully they will help restore what your brain needs to function properly. It won't be long before your itb is better and you'll be back on the road. Sign up for another race and get a pb. Things will get better.
See if you can run the samaria gorge, if not just walk it it's really nice. If you're any where near Rethymnol the sea front would make a lovely run. Not sure about Hania I didn't think it looked to nice.
Do you measure the carbohydrate quantity of your food accurately? some people think 5 bananas is a lot of carbs. You say eating the same, do you really eat the same food each day? If you're very sure of your diet then it isn't the wall 2 hours is not enough for that unless you're running 20 miles in that time.
Try 30 bananas or potatoes a day, (100g each 1)=600g carbs.