Guaifen-C and post nasal drip

Well the wierd dreams are definitely apparent, and the heart palpatations happen 4 or 5 times a day when I'm on it but it's no big deal (I dont think ) I sleep fine except for the dreams, but I think I sleep fine due to not having the post nasal drip there, so overall I am satisfied with the drug. Sometimes I feel restless but it soon goes away but that is about it.

I've had ringing in my ears for a couple of years. Found out it was from sinus pressure. At times my vision would go blurry from ther extreme sinus pressure.
I have been taking Guaifen PSE ER for a couple of months. It has lessned the pain and actually stopped the ringing once. Taking lots of water is very important. It is hard some times to handle the irritability, but harder to handle the feeling your head is about to explode, which it has completely handled. I just started noticing the problem with urination, which I do lot of with all the water I'm drinking. I wake up at night with post nasal drip and lots of phlem which I am happy to see go. No way I will take this for years as some have done. If it comes down to that, I'll call roto router to clean it out.
Does anyone know of a natural cure for sinus trouble?

I was up all night with my heart racing and I felt like horrible. And when I did doze off I would have the worst nightmares. It made my body hurt like I had the flu and the cotton mouth is horrible. I took one pill last night before bed and it is now 12:25pm next day and still feel like I have the flu. This didn't help with my sinus congestion either I had post nasal drip all night and still now. This is a horrible medicine!!