Hi and welcome from me too.
Sorry to hear that you have been experiencing such problems.
I certainly got out of the blue, stabbing, colic spasm pains at odd times from the Metformin and sometimes followed by the urge to pass wind to get release from the pain but couldn't always guarantee that was all I would pass

.... Not great when you are out horse riding I can tell you!!
😱 It did mostly settle down after a while. If you have been getting these pains for months but only been on the Metformin for a couple of weeks then obviously it is not the cause. I think I might be pushing for a pancreatic scan just to check things out with your levels being so high.
As regards telling you that you don't need a BG meter for home testing.... that is because they are ignorant of the power of diet in controlling BG levels. I would hang on from splashing out on self funding one though as they may start you on Gliclazide in which case they will need to supply you with one and test strips on prescription.... so wait and see what medication they offer next before you order one.
Out of curiosity, did your symptoms come on suddenly and have you lost any weight.... and do you have much/any weight to lose?