3 weeks ago i use hemp first time and its intoxication is very bad nd lasts 3 days and i think its gone but now i m feel very anxitey and fogy brain.?

Not sure what u took: Hemp does not have any psychoactive cannabinoids in it. Period. Whatever you used, it wasn't hemp, or something was added to it. From the fact it lasted several days, I am concerned that you took a combination of synthetic cannabinoids, like spice/k2. The chemicals can be sprayed on other substances, like plant matter or hemp. Don't do it again. These are dangerous drugs&have caused death.