Intoxicated

Can a person be intoxicated without substance abuse?

Do the effects of such intoxication last as long as two days?

And, in the first place, Is being heavy headed yet happy, heavy lided yet insomniac, and slurry diction yet clear in thoughts indicate intoxication?

If it does, I am intoxicated.
And if it doesn't, I am what-all-this-actually-means. ;)