Cranky 7 month old!

Brianne
Anyone else's 7 month old cranky and fussy all of a sudden? I had the happiest baby until about two weeks ago. Now she's only happy for a few hours in the morning. After her morning nap she starts with the fussiness. Crying, whining, screaming out of nowhere...and I can't figure out what to do to make her happy. Some say it's teething- I give her Tylenol, teething toys, frozen teething toys. We play on the floor, watch some nursery rhyme videos that she usually loves, I hold her, try her jumper- and nothing. She's just so cranky all day now. Anyone have any advice?? I'm praying this isn't her real personality now because she was so content and happy before this. Is this a phase? Mommy is going nuts here.😔