As the title says, he’s been to the vet twice, my ex-husband took him both times as he was keeping my/our cats while I was out of town for a week (we have kind of a ‘co-parenting’ arrangement, as cringe as that sounds). Before I left, he seemed like his usual self, but my ex starting feeling like something didn’t seem right with him about 3 days in, thought his left eye looked swollen and watery (he does have seasonal allergies, and it had been extremely windy following a lot of rain that ‘greened up’ everything), noted he started throwing up a lot, and didn’t seem to have an appetite, and opted to take him to the vet. None of those things had been the case before I left, mind you.
During that first visit, the vet said he was constipated (no x-ray was done at this time), he was tested for leukemia (came back negative), and looking at the receipt+what my ex reported to me, a complete blood count was done and he had high white blood cell count but everything else was normal, he was given an anti-nausea med (Cerenia), a pain med prescription (meloxidyl), a ‘feline viral test’, and prescribed some gastroenteric wet food, as well as a tube of Laxatone. No remarks as far as I’m aware about his eye being so watery. My ex took him home, put him in a separate room from the other cats with his own litter box to monitor for urination/bowel movements, his own water, and tried giving him the wet food and laxatives. He ate the wet food at first, but was still pretty lethargic, and never had a bowel movement. I urged my ex to please take him back the next day to get a x-ray because I was concerned he had eaten a foreign object or something, so he did, and they also gave him fluids because he was becoming quite dehydrated, as well as ran another feline viral test and an additional text billed as “Indexx Snap FeLV/FIV Test” (negative again), and gave an antibiotic injection (Convenia) because the conclusion was that he must have some kind of infection causing his white blood cell count to be high.
My ex seemed to think he was doing better, but I got back last night and spent time with my cat, and did some Googling and to me it seems like they definitely should have done a urinalysis to check for kidney failure, with how suddenly this came on, and the constipation. He has started throwing up the CatLax as of ~48 hours ago, and when I saw him urinate in the litter box last night, it was foamy. I do not think he has had a bowel movement yet, and his abdomen still feels distended, and his movements seem stiff, and he is quite lethargic, although he will vocalize like he always has when I sit with him and pet him and talk to him. He is definitely dehydrated again, and won’t readily drink water. As I’ve been in and out today, he has periodically moved from one spot to another, and has used the pet stairs to move to and from my bed. I am calling the vet tomorrow morning when they open but I’m trying to figure out what to even say, or where to start. Obviously a urinalysis needs to be done to rule out kidney dysfunction/failure, but I feel like either way he needs the constipation remedied and clearly the CatLax isn’t doing it, if he keeps throwing it up. I read a little about cat enemas administered at the vet office, but I have no real experience with this, or with a cat having constipation in general. Is that the best way? Does it always work? I’m just trying to figure out what I should ask for and what I should expect as far as risks, effectiveness, and cost.
One more thing: I noticed a little blood around one nostril when I checked on him earlier (the nostril is on the same side as the watery eye, if that’s worth anything). He’s had a little ‘crust’ around his nose before, during allergy seasons and during the dry winter months, that could sometimes have a little blood just like what happens with people, but this seemed different to me because it wasn’t combined with snot/boogers and it looked pretty bright red.

I’m sorry this is so long, just trying to give as much background as possible so that people who know more than me have enough to work with as far as identifying if there is something glaringly obvious that I haven’t thought of, or that the vet apparently didn’t think of either. Thank you in advance for any help.