What Causes Delayed Periods And Nausea?

hello my name is robbie i recently came off my peirod and it was a week long and i suffer from panic attacks but i was a day late coming on and i had no cramps but the thing that is worrieing me is that i am off my favorate foods n wen i do eat i feel sick but i have had un protected sex with my partner of 5 year can u help me pls