I know of the rash in which you speak. It wasn't fun to watch him break out and get bumpy (frankly, it looks awful), but it looks worse than it is. My husband had a childhood allergy to penicillin, and we wonder if the LO had trouble becaue of that sensitivity. We are working on our second ear infection currently, and we are using Cefinir.
The sleep trouble also sounds normal to me. He is also working on molars at the moment, so sleep is a premium. I am using ibuprofen before bed, and it does help him get through the longer part of the night before he needs snuggles.