NEED ANSWER TODAY ASAP!!!! TIME SENSITIVE urinary blockage and 2nd catheter in already for my 4 year old male cat, who has been in ER vet hospital since Sunday:

Full story:
Hi, my male 4 year old cat has been in vet ER hospital since Sunday (3 days now). They said he had urinary blockage and inserted a catheter. His blood tests and x-ray were normal, they said we caught the blockage in time. On Monday evening his urine through catheter and in the collection bag was clear and he was alert.

They removed the catheter at 10am on Tuesday (yesterday) and then at 2:30pm same day they said he did pee small amount once… BUT then they said he was straining to pee …and they reinstated the catheter! Is this ok, to give him so little time after first catheter removal, only from 10am to 2:30pm on Tue, before reinserting it??
Before and after reinserting this 2nd catheter, the vet said he felt an urethral spasm and thinks that’s the reason for 2nd “blockage”. My cat is very stressed so maybe irritation from catheter and stress is causing spasm? Is there anti spasm and anti inflammatory meds he can get, to reduce irritation and spasm risk? Can he get less liquids to allow more time for the spasm and irritation to calm down before he tries to pee? Can we wait longer to reinsert catheter 3rd time?

If they remove the catheter again today…..and he again can’t pee….what is the procedure? Can I take him home to see if less stress can calm him and allow him to pee? How long to wait at home? Can I give raw unfiltered apple cider vinegar with water?  Should I take him to regular vet if he blocks again? Take him directly to MEDVET in Chicago to have PU surgery? How do I transport him….1h drive….anything I need to do/know? I am in Chicago/ North Indiana area.