This may have been mentioned but I was on Chewy.com looking at the Thundershirt for one of my cats who cries constantly when awake to go out of bedroom suite (large bedroom with bathroom and private deck for warm weather), then when I used to let him out of bedroom would cry to go outside which I never let my cats do. All day and all night, has been doing this for years, (with me for 2 years and before that with my son for 5 years) Since I have decided not to let him out of the cat suite (8 cats there all of whom get along) I need something to help him so I am going to try this. Perhaps this may work for your cat or something similar..
ThunderShirt Anxiety & Calming Aid for Cats, Heather Grey, Medium - Chewy.com
ThunderShirt Anxiety & Calming Aid for Cats, Heather Grey, Medium - Chewy.com