Actual influenza doesn't normally come with vomiting and diarrhea so my guess would be you have something different. The first could've very well been the flu and then since your immune system was weakened, you caught something else. Since you've been sick for a week plus the vomiting and diarrhea, you'll definitely feel weak and blah until you can get more fluid and nutrients back into your system. Just try and focus on getting/keeping fluids in your system, Gatorade as well as water. Hopefully you're at the end of it!