Feeling totally fried for my first 3 days. Normal?

First day I got pretty euphoric. Just had to listen to music and walk around etc.

Yesterday I felt a bit high but not as euphoric as the first day.

Today I feel totally fried. Still unable to concentrate and feel narced out.

Is this normal? I mostly read about people having nausea, which I have had a little bit but these other feelings are more prominent.