building my confidence again after being made redundant .

Hello, I was made redundant end of August last year.. Its been such a bad time that whenever I start a position, within a few days or so I just loose confidence and I just feel that i'm not good enough for the job.
Its understandable that I feel like this because whenever I thought I was going somewhere in a job, my health becomes bad and I get chest infections, I have had them every couple of months since then.
Would like to know how to calm myself while asleep and while i'm looking for work and doing trial days in new employment..
Although I have started this week in a new job (trial for 3 months), I want to be myself again.
I have good days and bad days and its getting me down really badly.
I would like to hear from anyone who has any ideas to help me.
Many Thanks!  

[cj29]

Have you ever decided or have you tried counseling for your anxiety?  Switching any profession or jobs can cause a lot of unknowns and stress in my opinion.  Understanding the source of the anxiety can really help you start to deal with it and confront it in my opinion.