Emma, hopefully this is just a set back for you with the night sleeping. It does happen from time to time, especially around the developmental milestones as we have mentioned. It's really up to you whether you want to persist with the bassinet or try co-sleeping. Moving her to a cot might be another option - sometimes babies start waking frequently when they are constantly touching the sides of the bassinet. If you decide to go with the co-sleeping, there might be some options that can help with your back, such as using a side car co-sleeper or other aid.

It sounds like you are doing well with the feeding times, so I am sure this will all fall into place soon for you. Hang in there hun, you are really doing a fantastic job.