If Cold medicine makes your sickness WORSE!!! what does that mean?

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Last year I came down with a horrible case of the flu. I tried 3 different cold medicines and they made me feel worse rather than better. I also tried the classic tea and honey cold remedy and that also made me feel worse rather than better. Finally I took some Benlynn and I was better in 3 days!!! It was so effective compared to the other medications.

Today I was starting to think that I may have come down with something because I had a terrible coughing spell when I was at the restaurant today. I was also a little scared because the restaurant serves sweet, spicy and very high salted foods and I was worried that this would make my situation even worse - the the point where I would not be able to eat my food at all but I was lucky. The coughing spell went away as soon as it came and did not come back.

Today I took some benlynn which was the ONLY MEDICATION that helped me out the last time that I had a flu and I also had 2 tomatoes and then I started coughing again. It was like the Benalynn was making me worse rather than better.

Is it possible to be allergic to cold medicine? Why do some medications make me feel worse rather than better?
If Cold medicine makes your sickness WORSE!!! what does that mean?
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