For the seperation anxiety:Put him in a room, tell him to sit, and stay (if he knows those commands) and then shut the door.Wait 10 seconds, open the door, if he peed, don't shout, clean it up and try again.(sounds crazy I know)
Once he does this for 10 seconds without peeing, then try 20 seconds, then 30 and so on, work on it daily until you can leave him for as long as you need to.This way he learns that you're always coming back!
For the general anxiety:When he gets wound up, try and see if there is anything in the room he is trying to avoid, or looking at constantly.What time does he do it at?Random times?or one time on certain days, or every day at the same time?Something will be triggering it, if he is from an abusive home, then it is likely it is an everyday object that he is scared of, or something that he sees as a signal that something bad is going to happen!
Proud mum of : Gandalf, Lily,(ohm bettas)
Pineapple (male betta)
Jade, Indigo (hm bettas)
a few platys, a few guppies,
a few shrimp,
and whatever else sneaked into my tank while I wasnt looking
If it moves. . .BITE IT!!!