Fever is coming after 4 days. The!

My son started symptoms of watery loose motions, (10-15 times in day) Phelgum in chest, and fever on... 31/03/2024. We consulted dr.. He advise some medicine with azithromycin for 5 days... During the medication.. Only fever is controlled. But watery loose motion was continue.. Then we stopped medication after 5 days... Then...watery loose motion...was stopped... And he has motion 4-5 times day...(not watery). But fever has come again 102 degree.. We gave crocin.. Then fever stopped. Next day we get cbc test done.on 12/04/2024..result is... Wbc- 13600, ESR- 22, CRP is also high..but symptoms are nil...like no fever For 3-4 days, no watery loose motion. But on 16/04/2024, he has temperature around 100.5 degree. It means he has come fever again but no loose motion, and no Phelgum in chest.. Please what should we done next.... We noticed that as we give him antibiotics then watery loose motion start again. The