Re online CBT...
Some people find CBT useful in certain situations so I wouldn't discount (face to face) CBT completely. It's been picked up by the NHS because it's cheap to deliver, as it's generally time limited (a set number of sessions rather than open ended) and can be delivered by relatively inexperienced staff because it's manualised (there is a methodology to follow). It's also been easier to "prove it works" than other therapies and thus incorporate it into NICE guidelines (which are "evidence based" recommendations) because it tends to be very focused on a specific presenting issue, so you can give a client/patient a questionnaire at the beginning, get them to score how it affects them, and then repeat it at the end when hopefully the symptoms will have been relieved, at least for the time being.
There is some evidence that in the longer term it appears less effective than end of treatment/short term follow ups suggest.
I personally think online CBT is a travesty. Most research into therapy concludes that the specific type of therapy doesn't matter that much and that it's the relationship with the therapist that is the useful factor. You cannot have a relationship with an online self help course.
I don't really get why anyone would be referred for CBT for bereavement. The point of CBT is to help you identify irrational and unhelpful thoughts and behaviours and change them. There is nothing irrational or unhelpful about grieving in the aftermath of a miscarriage. It's just something you need to do in your own way.
If you do want to pay for a bit of short term counselling then have a look here to find someone: http://www.itsgoodtotalk.org.uk/therapists
If you want long term therapy it sounds like between us we've probably tried most things, so just ask 