My 2.5 year old talks constantly unless she is asleep or watching TV. She is incapable of being quiet, or whispering, we just hear a constant stream of what she is thinking about. Fortunately, it doesn't bother me, I am/was exactly the same, got me into a lot of trouble at school, but I really feel for you needing personal space right now. I would be putting her in pre-school/daycare now if possible, even if not for your own mental break so you can reset a bit, but so that with the help of caring adults other than yourself, she can learn to integrate with children her own age since that is an issue for her. If you need a break during the day in the meantime, I would recommend going for a drive with music on, going to a playground (even if it is with younger babies/toddlers so your DD gives you enough space to feel in control). If you are feeling really stressed, is it possible for a relative to assist you during the day or give you some time out?