Been on a 7 day 100mg course for sinus infection. Ive felt dizzin...

Been on a 7 day 100mg course for sinus infection. Ive felt dizziness, headaches, nausea, tingling in my arms and legs, heartburn, stomach cramps and my throat and glands swollen up. Also Ive been left with no energy and sleeping for 12 hours a night. As soon as I got in from work I was going straght to bed! Couldn't even be bothered getting a shower. Which is very unlike me as Im very active normally. My course finished 2 days ago and my heartburn remains as well as the headaches. And my sinus problem has not gone. This was not worth it! Never again!