Baby sick again

My little one went from a tummy bug to a cough/cold, both of which came home from her brother whose in school now. I'm so tired of sickness in my house! And it's really hard for baby, because there's not much I can give her to help her feel better. I just tried rubbing baby chest rub on her feet and she screamed as if she was in pain. Which is very confusing, because last night she seemed to laugh like it tickled her feet. She's exhausted but can't seem to settle down/get comfy to sleep. So frustrated for both of us :/ I just want her to feel better. :(