I have flu from a couple of weeks. Please help.

Hi doctor,

I am a 64 year old male, and I weight 80 kg, and my height is 1.62 m. I have this terrible flu from the last couple of weeks. I had three courses of antibiotic Clarithromycin for three days only, and I think that is the reason that the virus became stronger. I was also given two pills of Erythromycin, four times a day and finally Doxycycline, four pills for the first time, which I vomited while going home. I took two Doxycycline pills in that evening, two pills after 12 hours and then two pills once a day at the same time. I felt better after the last antibiotic for 3 to 4 days, but now I feel awful. I am either shivering badly or feeling very hot, and my mucus is currently light yellow in color. I did wake up five times last night feeling terrible. I tried washing my sinuses with a sinus rinse and had ginger tea. I feel very weak and unwell and desperate to get better. What to do? I am sick from a long time, and I have lost hope. It was categorically a chest infection from the beginning. 10 days back, I got my blood, lungs, and blood pressure tested, which were all normal. I have never felt so sick. Your advice in this matter will be greatly appreciated. I am desperately waiting for an answer from you. Best wishes.