Acceptance is often viewed as a grieving process, which is a great way to look at it because we do mourn our old lives from when we were fit and agile.
It can be a very emotional and anxious time because our lives need to change in so many ways so that we can adapt them to what our illnesses will allow us do. We do mourn the losses of our independence, mobility, social contact and possibly even our jobs / livelihoods.