2 years old's Behaviour Changes - Should I be worried?

My gal has been displaying vastly different behaviours and emotions for the past 1-2 weeks. E.g. she gets scared easily all of a sudden, previously she loves taking public transport now she is afraid whether it's on the bus, train or cab. She used to eat with the utensils, now she starts to eat with her hands and play with her food. She used to like washing hands, now she dislikes washing her hands and legs. She has also start to play with her tongue and saliva, scream suddenly and whimpers alot asking to be carried all the time. She has also started to beat me and my hubby and her head alot if things don't go her way. Is this the so-called "Terrible Twos" or something else which I should be concerned with? She has been down with Covid and HFMD last month. Otherwise, there has not been much lifestyle changes etc. For the last 2 weeks. #advicepls #pleasehelp #firstbaby