Fig: to be slightly unwell, not in one's usual health or state of mind; be tired, confused

I'll call you tomorrow around noon. I know that you're always out of sorts early in the morning

Ti chiamo domani mattina, ma sul tardi. So che il mattino presto sei sempre fuori fase

I've been feeling tired and headachy and generally out of sorts in the last few days. Maybe I should see a doctor

Da qualche giorno mi sento stanca, con mal di testa e in generale fuori fase. Forse è meglio che vada dal dottore

In these days nothing works out for me and I can't seem to get anything right. I really feel I'm not up to par

Recentemente non mi va bene niente e mi sembra di non combinarne più una giusta. Mi sento veramente fuori fase

I've had this constant headache for days and I feel quite a little off

Ho un continuo mal di testa da giorni e mi sento proprio un po' fuori squadra

The most popular theory is that this expression comes from the world of printing. In the past, when each page was composed manually (meaning putting together the words letter by letter), the letters needed to compose a word were called Sorts. Sometimes, the typesetter could run out of sorts, thus getting irritated or frustrated since he couldn't finish his task at hand. Other scholars, though, claim that the origin of this phrase is to be found in The Proverbs, Epigrams, and Miscellanies of John Heywood (1562), where Fit is defined as Fit (adj): disordered, out of sorts. Hence, it looks like that "sorts" is just a synonym for spirits/health