Hey, Jamie !
The emotional stress from your breakup is causing your sleep problems. You may find your sleep pattern disrupted for a while or at least until you start feeling more comfortable as a single person again.
One thing I will say is this,"you are not an incomplete person because you're single". I know you're probably feeling a bit lonely right now, but things do get better. You're a strong woman who will get through this rough patch.
For now, you need some distractions. Do you have a gym membership ? I recommend taking some classes. It's something to do to keep you busy so that you aren't at home stressing out. get out of the house and have some fun. Take a walk. Walking is not only great cardiovascular exercise, it's a great way to reduce stress.
And well, how about a teddy bear ? I have a teddy bear ! Teddy bears make wonderful company. They're good listeners too. They don't complain and they're very supportive. Oh and they don't take up too much space in bed.