Welcome here to the forum, it can be hard to set out things abut yourself to a bunch of people you don't know, and one can be apprehensive as to the result.
To the best of my knowledge imposter's syndrome is when I have a bout of depression combined with my ongoing anxiety condition. I undergo a period of low self esteem and even failure, and fear others will see this -in other words I'll be found out as a failure or at least less than I want. This has never in fact actually happened, I've been doing OK in the eyes of others.
Here my partner is a help in that a second unbiased voice can lend a new perspective to matters, and I often find I'm basically worrying about matters to much.
Do you have someone to support you?
You do say others regard you as a lovey person, and you are working in an extreme environment due to the virus.
So you are sort of wondering if you are blaming yourself or if there is in fact aggressive behavior showing. It may well be things you have said have been taken out of context, or more importantly are justified. Too many quick shifts in a row, larger than practical work targets etc. Those sorts of things can make one pass uncomplimentary remarks, which unless uttered in a rude manner, are legitimate things to say
I guess you know your management and if they are OK it might be worth finding out exactly that they are referring to, not to argue about it, just find out the facts. At least that way you will have something concrete to work from.
So you take it from there
I'm very glad you are seeing the EAP and particularly pleased about getting an external psychologist, very wis
Getting criticized is hard, particularly if justified, however I've found my best way has been to acknowledge the fault, apologize if appropriate and say you will try to do better -and then do so
Sometimes it may turn out that the criticizer is under overwhelming pressure which case you may some to sympathize with each other
If it is undeserved and the person concerned holds the power, then
thinking to yourself they are in error, and possibly limited by
intelligence or even greed, can leave you feeling that it is not you,
just the way of the world
I'm not suggesting you argue unless it is of overwhelming importance as I know in my own case that causes more grief and worry than leaving the issue alone
Then you go to a movie - no I'm not joking, distraction with something pleasant is a great thing
Please say what you think