My 2yo hit me in my right temple yesterday with a sippy , had a headache since and it's hard to open my mouth and hurts really bad to chew. thoughts?

Pain with chewing: This is caused by trauma to the temporalis muscle which is one of the muscles of mastication (chewing). If there is any swelling or bump there then you probably developed a hematoma (bad bruise with a blood collection). I would ice 3x per day about 5-10 minutes long each time. You can take some advil (ibuprofen) 600 tid or a natural supplement bromelain 1000 mg tid. This should improve in 3-7 days.