I've been made redundant 5 times and in 3 years of being with my current employer, we've had 2 re-organisations and I'm on my 3rd boss/department.

I think you have to accept these are the times we live in and consider yourself lucky to have a job.  I know I do.

If you keep dwelling on the past and what you had before, you will never move on.  Stop and think for one minute if you lost your job tomorrow...how easy would it be to get another job in January, and quickly?

I would try and find things to like about your job, or introduce new challenges or ways of working.  Speak to your line manager about personal development and things you would like to see happen in your new role.  Ask what opportunities are there for you to get more involved.

Good luck.