Mine started around 6 weeks or so, if I remember rightly, and began to improve around week 11. For a few weeks, I would have a bunch of good days, then a not so good day or two. I am just now starting to not take the B-6 (that seemed to help me a lot.) I am still afraid it will come back!
I remember feeling like the sickness would never end, and that there was no way in hell I was ever going to want to be pregnant again, but looking back from my current lofty position of 19 weeks, it didn't seem to be that bad. Selective memory, I guess. To answer your second question, once the sickness stopped, I didn't really feel pregnant at all for a while. Now I am starting to get a bump, and in between the general worry that all is going well and freaking out about my body's changes, I think I am enjoying pregnancy more.
If you are having a really rough time, definitely talk to your doc about meds. Otherwise, lemon/sour stuff, vitamin water, and eat what you can whenever you can. And remember that, while it could last till the end, the majority of people see some relief once you hit 2nd tri. GL with your pregnancy and hope you feel better soon! :)