Sorry can't give any real advise here ... but just wanted to say Poor you
, you've really had an unfair share of problems!!
Yeah we've heard this can be related to stress/boredom or change too ... have you had any different treats or food if no other change to routine/life!?!
We've caught Charlie-Spud having a quick chew on his rear foot lately after a good ole scratch of the head! But luckily he stops and it's not a concern yet.