Morning sickness started properly at around 5 weeks for me with both our girls and was a lot worse with DD2. I believe the lack of time to rest (as I was running after a toddler) made it worse with DD2.

The 24/7 nausea lasted until about 15 weeks or so with both girls. I took Maxalon with DD2 which helped a lot.

Like Peanutter said, I found extra sleep and rest help significantly as did snacking frequently. I always had crackers, dried fruit, a banana and apple on my bedside table so I could snack overnight (I felt like vomiting when I got up for the loo at night too) and also nibble on something before I got out of bed in the morning.

I also just ate and drank whatever helped ease the nausea in the early days, my healthy eating went out the window! I did snack on salt and vinegar chips and drank Coke quite a bit. I'm normally a very healthy person and rarely drink Coke so it was odd that it became my saviour!

Warm baths and showers also helped a lot. I use to get in the bath or shower with DD1 before DH got home from work. She had fun, had a wash and I got to relax a bit. I don't know why but warm water really helps me when I'm nauseous.

Congrats on your pregnancy, I hope the MS subsides quickly.