Kidney infection ...HELP

Hey

So I had a UTI turn into an upper UTI in the kidneys and I had 3 days of trimethoprim which didn't work and now I am on day 5 of Co amoxiclav and only 2 days to go. Although I have stopped peeing all night I am now having severe back pain again feeling sick and TMI peed out milky urine which the dr said was puss. Now with two days left I though at this point I would be getting better not going backwards has anyone had this before?? A culture needs repeated as the first one was lost 😔
Any help would be great x