I don't know how much help I can be. I'm only 13 weeks along and still nauseated enough to be unable to go about my regular routine. I can't touch raw cheese or meat without getting horribly ill. I do know this did not happen with my prior pregnancies. The morning sickness disappeared like magic at the start of the 2nd trimester, or so. I've tried all the advice from doctors, mothers, etc. to help with the nausea, but nothing has worked. The only things I have found to help at all are root beer and (no joke here) greasy potato dishes (potato salad, fried anything with potato in it).
Try experimenting with certain foods and see if anything helps. Especially try to eat food you are craving - there is often a reason for the craving. Make sure to eat every couple of hours - smaller snacks. Don't get too much sugary foods. See if napping helps - my baby seems to let me know what it wants by kicking up the old morning sickness. I get the worst when I'm tired, haven't eaten VERY recently, stressed, been around chemicals, sometimes even when I'm a bit sweaty. Also check for smells in your home. Perfumy smells can irritate you even if you like them. Hidden mildew can also cause problems.
I've never known nausea to last beyond the pregnancy, but I've heard on rare occasion of it lasting throughout the pregnancy. Hopefully, you just have a demanding baby who knows what it wants and is determined to get it, even at the cost of your comfort. Stick in there... it sounds like I'm going to be with you the whole way!