Feeling wierd , suggestion

I've had a headache like a sinus feeling headache since yesterday, today and all last night I've been really crampy my back and stomach but my back is the worst. Baby is moving but not as strong as he was I'm 35 wks so it makes me nervous :/ should I be worried or am I overthinking :((  I just feel so blah I've taken Benadryl and Tylenol not working I've had tons of water I drink about 60 oz a day , I'm laying down but no luck :/