Hi if it is the flu you will most likely need more than over the counter meds. You would need somethig like Tamiflu.
Natural remedies for a cold are: Elderberry, Andrographis, Rhodiola, Isatis and large doses of Vitamin C.
You can take up to 3000 mg Vit C but if it causes diarrhea just lower dose.
You can also add Astragalus but not for those with late stage Lyme they say. Although I have started taking it daily and I am good so far with it(20 drops 3X day).
Kudzu root helps with pain.
Hope you feel better soon, Take care, Jo