If there is something [energy, curse, spirit...] The banishment spell is a good idea, but a simplier way is a cleansing bath and burning sage. The bath [salt and water being the easiest] will cleanse your body. As you sit in the tub, pour the water over you and visualize/feel negative energy being washed off and replaced with positive energy. When you pull the plug, feel/visualize the water taking the energy away from you. For your house sage does the same thing. Open all doors and windows and waft the smoke throughout the house while chanting or thinking 'get out' or whatever you feel like saying to send the negative energy away. Once you're finished you should cast a protectiom spell to keep the bad vibes out.
For you daughter you should look into protection or health charms/spells to help with recovery and guard against further health issues in her early days. For finances a honey jar spell or another type of wealth spell to attract good finances your way. As for your boyfriend I feel you should talk it out as a spell to keep him isn't the best idea as you're forcing your will over him. Plus, with your daughter being sick, he could simply be distancing himself as he grieves/worries. Just talk to him.
Before you do anything magickal though you should study and learn/understand what magick is, how it works, and what it can/cannot do. Blessed be.