It's a mystery as to why the poor little mite had this issue. Sometimes there is nothing that can be done. My first piggy Shadow had bladder issues that wouldn't go away, and by the end her bladder was in a really poor state. The op she had to try to help her pushed her over the edge and she died shortly afterwards. My point is sometimes all the help given is not enough, and the signs of their illnesses can be misleading, with symptoms being those of more common problems. Perhaps with Jericho he had a strain of bacteria that was partly resistant to the antibiotics, and perhaps he had swelling due to long-term bladder irritation that kept blocking him up? But perhaps all we can do is sit here typing 'maybe this and maybe that' - I don't think you will ever have all the answers, as I will never quite know with Shadow, and not knowing makes things worse somehow. And like you I tried to help my others who died anyway - it's soul-destroying isn't it? Snowball seemed to be getting through her chest infection but then died, just as I had got her life sorted out in terms of finding a happy mate. The timing of it rubbed it in somehow. Sunrise was sent (thanks to the very kind help of this forum) to one of the best vets in the country but had an issue that took everyone by surprise and couldn't have been predicted, and she died. You do end up feeling like you try all you can and still it doesn't go right for them, and it is so damned sad, especially when it is like this one after the other.
But you did your very best, both of you, you took him to several vets as I recall and you did what you could to try to get to the bottom of it. What else could you have done? I just hope that now this run of dreadful luck is over and that your other furries live healthy lives. It IS soul-destroying when it goes on like this, I do tend to think it's a bit of a lottery with piggies, some who never have a problem and others who are in and out of the vets. I know too that you have taken on piggies who had health issues missed by those previously caring for them, and you've done all in your power to make things right for them.
You're a good person Kerrie, a very good person. You really have been the most vigilant and proactive of guinea-slaves when it comes to caring for their health and providing lovely set-ups and the right social interactions for them all. I've said it before and I'll say it again, all of your furries have been very fortunate to have ended up in your care and nothing any other piggy-slave could have done would have altered the outcome for those who have had ill health.
Huge hugs to you xx