There is known phenomenon with thiamine supplemantion , called thiamine paradox reaction , or thiamine paradox . It means you feel first worse before start getting feel better. It`s a sign there was/is indeed great need of vitamin B1 thiamine ,
What Is a Paradox Reaction to Thiamine? Understanding the Unexpected Effects of Vitamin B1
What Is a Paradox Reaction to Thiamine? Understanding the Unexpected Effects of Vitamin B1