You have not mentioned how much fever do you have now. Check with thermometer n record somewhere. Fever feeling can be because of weakness. How is your appetite. I need details. In the meanwhile follow this 1. Don't take tea empty stomach. Eat something like a banana (if you are not diabetic) or any seasonal fruit or soaked almonds and a glass of water first thing in the morning (within 10 mins of waking up). No only biscuits or rusk will not do. 2. Don't overeat 3. Take your breakfast every day. Don't skip it. U should eat whatever your mother or grandparent eat in bfast. I mean to say whatever is your traditional food. If punjabi eat paratha, if belongs to south then take idli/ dosa etc.
4. Have light meals every 2 hours (in addition to your breakfast, lunch n dinner) e.g. Nariyal paani, chaach, a handful of dry fruits, a handful of peanuts, any fresh n seasonal fruit, a cup of curd/milk etc
5. Finish your dinner at least 2 hours before going to sleep.
6. Maintain active life style7. Avoid fast foods, spicy n fried foods, carbonated beverages
8. Take a lot of green vegetables n fruit. 9. Drink lot of water.10. Everyday preferably sleep on same time
for more details, you can consult me.