Guaifen-C and upset stomach

Dr. prescribed guaifen w/p-ephed 600/120mg 2x a day for sever sinus pressure - it certainly has releived the sinus pressure. My side effects have been racing heart beat shortly after taking, upset stomach within minutes and the most problematic has been the feeling of itching on the front of my entire legs, front & back upper torso - especially the upper back and entire scalp as well as waking up 1 hour after taking the PM dose - full of energy - getting ALOT accomplished. However, I am going to stop taking this medication as I want a full restful night's sleep and want the itching to STOP. I personally will never use this product again. Thank you everyone for your input - it helped me greatly. sincerely - sleepy!

I've taken this medication a number of times and the only real side effects I've noticed are the upset stomach if I haven't eaten or haven't consumed enough liquids as well as the sleeplessness. I toss and turn all night long and the slightest noise keeps me awake. Sometimes I think my hearing is hightened when I'm on this medication as the ticking of the clock seems abnormally loud. I will deal with the lack of sleep for a week or two if it means I'll get rid of the tremendous sinus pressure I feel.