Suggest Remedy For Insomnia

I have been prescribed Budeprion SR. 6 mths ago my pharmacy changed manufacturers and I have been sick ever since. I just figured this out. My pharmacy switched my medication back to my old manufacturer but I am still sick. They told me to take it for 3 weeks to see if nausea goes away but the nausea is debillitating. I can't eat and when I do eat I get sick. I can't sleep because of insomnia. I thought it was benadryl for sleep making me sick but I stopped that for three days and am still sick. I couldn't sleep those three days. The only thing that helps is chamomile tea. I was on anti nausea med and acid reducer from July to Oct but they stopped working. I never thought it was the budeprion until I put 2 and 2 together. Can I just stop taking it? I did for 2 days and the nausea got a little and I mean a little better. I took the budeprion on the 3rd day and woke up on the 4th day sick as a dog again.