I saw your question just now ( Friday june 29th 9:30 pm Indian time). Though it is late for your child, this being in the public forum, I thought others may find some aspect of the answer appropriate to them.
This child needs evaluation if the fever lasts for more than 24 hours.
Let me explain. The first fever from monday to friday is viral fever
which recurred after 72 hours. Still viral fever is a possibility. We call this second peak, but the second peak in viral fever will not last more than 24 hours and in general does not touch 102.
can cause stomach cramps
( mortin). May be your child needed antacids at that time.
Pain due to ibuprofen is above umblicus and in the middle associated with nausea
Urinary infection can present with fever and stomach pain.
We have to explain the cough
. Cough can occur in viral fever and it takes upto 2 weeks for it to be cleared.
We give antibiotics : if sputum is yellow.
Exhaustion also needs to be explained. Post viral child can be exhausted so also anaemia
If the child had appeared pale with exhaustion, then medical evaluation is a must
In conclusion, second spike of fever lasting for more than 24 hours needs evaluation.