I was sick for most of my stay in Hanoi so I just slept in my hotel and ordered Grab food. I didn’t get to explore the city until my last day. I ended up canceling my 24-hour bus ride to Vientiane because I wasn’t sure I’d make it in my condition. Instead, I booked a flight to Chiang Mai the next day.
I feel like I got sick because of the bus ride from Hue. If you’re traveling Vietnam, I would recommend taking the train instead of the cheap sleeper buses. At the very least, do not go with Hoang Long. Take a chance on a different bus company instead.