Oh I'm so sorry to hear this. Did the bloat get worse after the antibiotics for the respiratory infection started? I know you've been battling it anyway...
I don't know Buprex but we do get a pain killer called buprenorphine which is an opioid. It is a very effective painkiller (and bloat can be very painful sometimes) but one side effect can be loss of appetite. If you have this effect you'll need to be a bit careful...
When my pigs have been on buprenorphine (such as after surgery) they have been totally stoned. One girl didn't eat anything at all for several hours then just suddenly shook herself and started eating again as if nothing had happened. Poor George hid away in his snuggle bag and didn't come out till the next day - it took longer to wear off for him because he's older. I had to literally rub food on his mouth for him to 'come to' and eat a little before he drifted off again. If your Buprex is a similar product just keep an eye on her appetite - to battle bloat we need to get the food in little and often to push that gas through rather than have several hours of not eating followed by a couple trying to make up for it before her next dose.
Louise's bloat was a short, sharp shock for us as we've never seen it seriously before but she literally felt like a hard barrel and her eyes squinted in discomfort. It unfortunately took me a day or so to notice because she's so immensely fluffy. She got emeprid and metacam and she was massaged on the sides with an electric toothbrush handle. The vibrations are supposed to help break up the gas. She had a heat pad with a fleece on top to help her try and relax. We tried to give 'gripe water' (a product aimed at babies) but she wasn't keen. But a combination of syringing, heat and massage all helped push that gas bubble through (they can't burp it up). Here's a link if it helps at all
First time with bloat - and it's Louise
Keep up with whatever probiotics you have while on the ABs. I used a mix for George in the end of Benebac, fibreplex
and poop soup all mixed into his slurry food.
Perhaps the fact that she seems to have had her URI rumbling along all this time has caused her gut to be erratic.