Hi
I'm new to this forum but have read a few of your posts about your problems with Oliver.
It sounds alot like my son at a similar age. Has it been suggested to you that Oliver is cows milk intolerant? This can cause the abdominal pain, mucusy diarrhoea, reflux, vomitting etc.
My son was changed onto a hypoallergenic milk formula (on prescription) called nutramigen, and he has been completely different since.
It may be worth asking the doctor to prescribe this to rule it out, if nothing else.
PS don't let the doctor palm you off with soya based formula, as intolerant babies often have a problem with this too!
Hugs to you, i know how hard all of this can be
Sxx (sorry if this has already been suggested and ruled out)