Why am i feeling different from the headies i smoked?

Ive been smokin pot almost everyday this week but today was the first time i tried headies and i was terrified when i was high. I wasnt laughing or feeing good and i only took one hit that kept me high for two hours. My eyes dont realy get that red but this made every vein turn bright red. After it wore off i was the realy tired and it seemed like people kept calling my name when no one was. Now I feel very different and don't know what happened to me. Anyone know?