Hi,
Please go and check immediately with a physician if you have a relapse of fever. Try Triphala for stomach pain, 1-2 tsp before bed at night with normal water. Also take Hinguashtaka churna 1 tsp + Mukta Shukti 5 mg(approx. 1 pinch) 3 times a day. This you would definitely get in a Patanjali medical store.
Best wishes
Next Steps
Please consult a physician is the condition doesn't improve immediately