Talk to Pediatrician on Baby Sudden Behaviour Change

Salam My baby is very fussy n cranky from past 5 days.hes 18 month old mashallah....pehly aram sy lap ma sojata ta.ab he pulls my hair nails marta bite krta itna rota....bed pa sulane ki try krti uth k andery ma walk start krdeta.....lagatar 12 gante jagne k bawajood esye he behave krta hai.....halanky kabi esa behaviour show ni kiya....ush ko flu or gala b kharab hai magar ush sy 4 din pehly b yehi kr rha ta.it take me 1 hour to sleep him jis ma he continously agressive towards me.....i m very depressed n worried.plz help me.wat can i do????