Help?

I think I'm going to go insane and never blog again. Does anyone know why I am having such trouble getting my posts to publish correctly? No matter what I do or how I fix them they publish all crazy -- giant line breaks where I never put them, some paragraphs smashed onto each other rather than separate, gaps between pictures that were placed right next to each other. I don't know why or how to fix it. I use the old editor, but don't know if that is the issue, but it really takes the fun out of posting for me when I then have to spend a fruitless hour trying over and over again to make line breaks be where I put them! Anyone???