Hi,
it’s your first episode., so it’s not chronic.
Fever subsiding is a sign of recovery.
Gastritis symptoms may be because of the antibiotics,.
Take adequate rest, eat soft diet ( no oily foods for next 2 weeks) , plenty of water.
Leg pain could be due to dehydration.
Weakness will take few days to go away.
Next Steps
Follow up for treatment of gastritis.