Welcome to the wonders of mindfulness and great you've found this forum. Gareth has done a great job in setting it up and running it.
I am one of the authors of MfH (Mindfulness for Health) and am interested to read your comments. Delighted that week one worked for you and it is quite normal for the Breathing Anchor to be a little more difficult. I can understand how pacing isn't so applicable to your situation so I would recommend you simply skip over that stuff but continue with the rest of the course. All the methods are applicable to stress and anxiety as well as pain. I'd be v interested to hear your feedback if you do decide to continue. One of the things about mindfulness is just to 'do it' and not be so concerned with immediate ups and downs. Perhaps you could work your way through our programme and then go on to FPIFW and the elephant book. That way you'll be kept occupied with deepening your mindfulness for months
and all the diff books and programmes complement one another.