Worried, scared, pregnant? Paranoid?

I had unprotected sex with this guy that I saw seeing the day that my period literally ended which was 2 weeks ago will be three weeks on Saturday. And I know there aren't any chances of me falling pregnant because I had sex on the day that my period ended and after I had unprotected sex I noticed some bleeding and I had cramping days later (on and off). But it's stop. And recently I've been feeling weird, I've been sleeping ALOT which is unusual for me because I have been suffering from anxiety and it's also affected my sleeping, I've get easily tired and I can't stand up for too long because I feel dizzy. What should I do?