Sulfamethoxazole Stomach Ache, Sinus Infection, Gums, Feel Better Today, Mouthwash

The doctor at the university gave me this for my sinus infection. Thank God it was only a five day prescription. I'm on the last day as we speak. I ran into this site while searching for side effects. My symptoms have not been as severe as others. Headache, fatigue, stomach ache, and an uncontrollable appetite. I'm drinking water but not that much. Only around 40-60 ounces a day which is obviously not enough. I've been staying up very late at night. Bedtime is around 4-5 in the morning. Last night I noticed redness on my gums. When I brushed my teeth and used mouthwash it burnt like all hell. My gums feel better today. It hasn't been fun but I will say the medicine did its job. I don't feel the "rock" in my throat anymore thats for sure. Which is well worth the price concerning the side effects.