Thanks for your query
Your words suggest towards upper respiratory tract
infection which may be mixed bacterial or viral.Your test came negative for Strep but there might be other bacteria involved or may be viral.You need to continue the antibiotics atleast to prevent further superinfection
by bacteria... CoAmoxiclav 625mg tablet thrice daily for 5 days would be a better option.
Do warm saline gurgling four times daily for 5 days
Take Vit C 500mg
tablet once daily for a week. Eat plenty of citrous fruits.
Have plenty of fluids.
500mg tablet twice daily for 3 days and thereafter sos
Take Levocetrizine 5mg tablet twice daily for 5 days
Do a repeat throat swab culture sensitivity testing if possible.
Get a clinical checkup from your doctor and take his advice.
Hope this helps
Update here how you stay.
Take care :)