Some pigs are by their very nature gassy pigs. One of my boys gets a bit of a swollen gassy tummy on occasion and that means he is developing impaction and needs a clear-out.....then he's fine for the next few weeks.
From looking at the threads you have started on Finny I think all his history/symptoms need to be taken into consideration.
He is 3 years old (is he neutered?) and has always been a greedy pig
My understanding is that the matter of concern are
a) weight - this is increasing despite his restricted diet and he is now up to 1.7kg
b) possible diabetes - but this hasn;t been diagnosed by blood test, only urine test - which given he is on Gertie could be a false positive. Nevertheless he has recently been prescribed glibenclamide
c) now he has gas in the intestine which developed to cause a distended hard abdomen earlier this week -
He also had an op to remove a fatty lump recently (from where? how big?) and developed crackly breathing afterwards (and loss of weight) which has now resolved with associated return to his normal weight.
Let's deal with the gas first: Could this be a result of the glibenclamide? Is it being given orally and how long has he been on it? I note you say he is on occasional cabbage -what did he eat/ingest 24hours prior to the gas developing (food and meds)? I would in any case cut out all leafy greens/brassicas for a while and see if that has any effect Also keep him on cisparide and zantac for a while and see if that helps get rid of the gas (certainly wouldn't use infacol - that could also be the reason why his tummy became more swollen because the gas bubbles coalesced into one bug bubble). There could be a really simple explanation for this that is dietary related and, unless a blockage is suspected (in which case it would be an emergency) I do not think his current condition (especially since he is eating/pooing etc) merits exploratory surgery (which is extremely drastic and can have all kinds of complications once you start prodding their intestines, leading to infections an/or adhesions developing etc etc).
However factoring in the weight gain, then clearly something is going on. Nevertheless, neither me nor my vets could justify resorting to exploratory surgery without first doing blood tests to check for both diabetes and THYROID ISSUES (an underactive thryoid can explain weight gain despite reduced calorie intake). At the same time blood would be tested for heart and kidney function as sometimes developing issues in these organs can cause fluid to accumulate with a resulting weight gain.(and also can mean the pig is slower to recover from a GA)
I believe
@Abi_nurse has already suggested blood tests in your other threads...and personally that is what I would do next (with associated gut motility meds/no green veggies for the gas) .....and then imaging (ultrasound or even MRI/CT scan)..
Exploratory surgery is always my last option now following my experience with poor Beech - he had gut problems and despite opening him up we were none the wiser as to the cause, it exacerbated the problem so badly he had to be PTS..... and even after a PM we never found out what was really going on.
Hope this helps
x