For those of you who have dealt with severe morning sickness please answer.?

I am a SAHM of three-5,3,1 and I also go to school full time. Mostly online and once a week on wed nights. Hoping to be a nurse in three years. Anywho, we would like to have one more that will hopefully be due after december to coincide with the break between my prereqs and nursing school the next fall. SO..we will be trying soon but I am worried about the morning sickness. I have SEVERE horrible morning sickness ..I take Zofran and welbutrin(I also always get depression from like wk 8 to about week 18 Dont know why) I just feel so horrible that I worry about keeping up with all my responsibilities with the kids, house and school..Have any of you dealt with really bad morning sickness and feel like you found a way to conquer it?? And I don't mean..."I ate a cracker before I got out of bed" We aren't going to really start trying until next month...Im just tryiing to plan ahead. Did you build up your health before hand and it helped or anything. Some advice please? Thanks!