Nausea 2nd trimester

Anyone experiencing nausea even in 2nd trimester? I’m few days to 16weeks, feeling sick and nauseous when nightfalls (starts 7-8ish in the night). Tend to vomit when taking a shower at night too. Just feel really awful and whole body just weak when night comes. My first trimester I had nausea all day long (on and off), but was hardly vomiting except on a few occasions. 2nd trimester then started to vomit in the night. I know some people may have morning sickness even after the first trimester, but is it normal to feel sick and weak all night and only at night. What can I eat or do to strengthen my body?