When it comes to textures, you have a great many choices. If you would like to put on a new texture yourself, you need to know a few things so the results you get will be satisfying.
You may need to scrape down the old stipple ceiling texture you have, and maybe even skim coat it first, before you put on new texture.
To get the tips and pointers you need, go here for
texture information.
To find out how to
skim coat,
and to fix bulging plaster (you may have to remove it where it bulges), go to
this webpage.
Good luck.