Guaifen-C and ear ache

Have been taking for over a year. When I ran out a month ago I got the worst ear ache of my life. My sinus' blocked up and busted my ear drums. I have never experienced pain like that in my life. I take just once a morning. 600/120 type pills. I sleep on the average 9 hours a night. I'm now truly scared to go without it. My pharmasist said not to take it on the day of my upcoming marathon in June due to possibility of heart rate issues. She didn't mention anything about dehydration. I'll be taking it the very next day.

The doctor's office prescribed Guaifen for this inner ear ache. The pharmacist explained that this medication has a stimulant. Since I'm a heavy diet pepsi consumer, I didn't think that Guaifen would keep me awake. After two hours of sleep I awoke and can't go back to sleep. As prescribed, drinking a lot of water goes with the medication; the side effect is frequent trips to the bathroom. Now, its 6am and I wonder when I will sleep again.

Taking 2 pills per day with 3 pills per day of Amoxicillin for sinus and ear ache. Severe stomach and lower back pain. Alot of gas. Crabby (probably due to only sleeping 1 to two hours without waking up).