pseudoephedrine

Yesterday my body was starting to get sick, yet again; It wasn't nearly as bad as last week , but i did see a few similar symptoms.  I decided to buy Aprodine with pseudoephedrine because it relieves the post nasal drip. Usually anything with pseudoephedrine is supposed to make you extremely alert and awake, but in my case it did not. Instead of me being alert and feeling a relief of symptoms  i was really tired, although the symptoms did go away. I felt drained after an hour of it in my system, which is very odd. I learned that this is called a "paradoxical reaction". This means the medication does the complete opposite of what it is suppose to do. I believe i had that reaction happen to me, there is no other explanation. The problem is that it is the only thing that works for me when it comes to allergies and or post nasal drip. I hope that i can overcome that reaction, or i will have to get prescription strength , which is not what i want.