Cosmo is sick

Question
I have a sick four month old male guinea pig.  Symptoms:-
*  laying on side (looks paralised) can't get up, needs my help to sit him up in sitting position.
*  yesterday bled in urine so took him straight to vet.
*  on way to vet, in box, bled two tiny blood clots.
*  vet said not infection cos of blood clots... said they indicate a crush injury.
*  Guinea hasnt left cage or been handled though.
*  Vet gave him injection for pain.
*  Cosmo just sits and doesn't walk or move much.
*  Still has minimal appetite ... I am handfeeding him round the clock and giving him vitamins and lectade in his water to keep fluids up round the clock.
TODAY is day three since i noticed he was sick.
I lost two guinea pigs in the cage next to his two days before... didn't notice any symptoms just dead in cage... vet doesn't think linked but I am at a loss.
Also this morning I noticed he seems to have probs with his mouth.... eating??  It also appeared all along that his front feet hurt as he falls forward on his face...

Have you got any ideas??? I don't want to go back to vet and pay even more money and get no result.

Answer
Okay, I'm not a vet but I have a couple ideas.  The blood in the urine could have been caused by some sort of tramua or he could have a bladder infection.  If there is a very sour smell to his urine, he most like has a UTI.  Less likey: he has bladder stones, an xray can determine that but I don't think that's the case.  A UTI can cause lethargy and pigs will typically remain in a hunched position.  This can be cleared up with an antibiotic usually and/or steriod therapy.

If that's not the case, he could have an inner ear infection which is throwing off his balance and making him unable to get up.  The head will often appear tilted.

My last idea is that it could malocclusion.  The reason I think this is because of what you mentioned about his mouth and not being able to eat.  Malocclusion is basic the inability to eat due to painful elongated or improperly rooted teeth.  While this mainly occurs in older animals over 2, it is also genetically linked and could be presenting itself in this younger animal.  My only other guess is it could be a mineral deficiency (calcium or vitamin C) which has now progressed to bone deformity.

Keep feeding him and getting fluids into him.  Keep him as warm as possible (heating pad or hot water bottle).  I know you took him to a vet but he may need to go again since they didn't really fix any of the problems.  I'm not sure why the other 2 would be dead.  Did you notice any visible symptoms on their bodies?  None of what I mentioned except maybe the UTI but even that is slim.

Keep me updated and let me know if you get any more details...I'm hoping for the best

~Lauren