First time on a hectic trip and its getting overwhelming

I am in spain right now, 2 nights in barcelona, 2 nights in madrid (train transfer), tenerife 4 nights, malaga -> granada -> valencia -> Barcelona via car.

I am getting very overwhelmed with anticipation on whats to come. I have realized i am not a hectic travel person at all. I can 1 to 2 cities max. 2 weeks for all of these is too much.

I did not plan the itinerary. I was trying to go with the flow for once.

I have this impending sense of doom anticipating what is coming as so much can go wrong and we haven't been here before.

I don't know how to make this feeling go away. Its ruining my present moments.