Oh dear Alan,
I'm really sorry to hear that you have had such a tough time of it last year. There are some real jerks in this world - totally without morals and yet they can still sleep soundly at night!

I hope things fall into place with building up your piano teaching - no doubt it would give you more pleasure to be giving to those who want your expertise than to those who just want to take advantage of you.
I hope your ex-boss comes to the same sticky end as

as it sounds as if he was a Rotten Egg through & through!