Hi @Sjill
Welcome to the community that uses this forum 
I tried to say hello earlier but it seems the forum software was in read-only mode - very strange
It’s hard for us to be specific when we don’t know personalities. The effects you describe are not a surprise. It don’t recall the exact same in other posts that touch on similar effects, I do recall many with peripheral mention of.
The general topics of “cross”, angry, argumentative, personality change, etal are here and discoverable with the magnifying glass icon at the top of the page. If you search find some that sound more but you can refine the search I including the authors @ name in the search bar or by going to their profile and accessing their posts from the list.
This may be a case where a third party will be seen as more believable? It hints at disruptions to executive network and following through ordered sequences of thought into language. A nuro psychologist or similar specialist may help to clinically diagnose. I remember tests where I was given a story and then had to relate it back to confirm the degree of ability to sequence and explain - zero use for addressing the issue but it did put a name and a numbered score to post stroke capability (and not having a score for BS[1] was equally isolated in meaning )
There are many sorts of aphasia such as Wernicke’s aphasia, Anomic, Expressive etal.
James Major[2] at Aphasia Support maybe able to sign post diagnosis and treatment paths https://aphasiasupport.org/ and 01924 562443
Caio
Simon
Ps
Of possibly marginal use the following two links may be useful