Guaifen-C and dreading

I was prescribed Guaifen PSE 600-120 for a sinus infection. I took the first tablet at bedtime Friday night. I normally nod off in 2-3 minutes but here I was, 1.5 hours later and I was still wide awake. At 11:30 pm, in an attempt to put this perplexing energy to a productive use, I went downstairs to my office to get a little work done. At 5:30 am I finally got a little sleepy. I then slept for 1.5 hours and couldn't sleep any more. I showered and took another tablet, dreading how tired I was certain I'd be that day and looking forward to a nap. It wasn't long and I felt re-invigorated, like I'd just had the best sleep of my life. I went all day and into the evening, when again I took another tablet at bedtime. Repeat of night #1. Apparently I'm a little slow on the uptake, but I decided that I should investigate this drug for possible side effects. Aha! I experienced the bizarre! dreams when I did doze off, and an emotional plunge (that I never have) too. The upside is that I realized an overnight improvement in my sinus condition, thank goodness that the misery wasn't for naught. Oh, anoher positive side effect is weight loss due to a lack of appetite...LOL All in all, there's got to be a better way to get sinus relief and I'm calling my physician first thing Monday morning.