Is it normal to feel kind of weak after a double dose of hep b and TDap vaccine?

I am one of the like 10% of people who don't easily develop antibodies to hep b from the regular vaccine. My doctor (an infectious disease expert) decided to try to double dose, and I also got TDap. This was yesterday...I was fine until about 2pm today when I started to feel exhausted, like I can barely sit up. And really hungry...I just ate a whole small load of bread o_O. Think the vaccines are prolly causing this or am I imagining it?