I thought you're supposed to feel better in your 2nd trimester

I thought you're supposed to feel better in your second trimester! Although I'm only in my first week of the second tri i feel awful! I felt great last tri and now I'm incredibly exhausted, my stomach is always either constipated or diahhrea, my body aches and I just feel overall icky!! Just venting lol but all I want to do is curl up in bed all day and watch movies.