I have a great deal of trouble going out of the house. It is exhausting and when away from home I feel a powerful emotional "pull" to get back inside and into bed, or perhaps a hot bath.
Going out to things I have to do - doctors, social events, shopping, leaves me empty and without energy. sometimes taking days to rebound. I'm pretty sure it has to do with the anxiety and triggers of PTSD and disassociation, where being at home and curled up is "safe", and going out among strangers, or in busy environments is "unsafe".
Completely at odds with my logical, intelligent mind, but try convincing my nervous system and unconscious mind that the outside world is safe. Having coped for decades by suppressing my emotions, then had a nervous collapse and fighting high anxiety symptoms for several years it is very frustrating, also isolating and feeds co-morbid depression.
The procrastination to go out is obvious too - dressing, washing, getting organized is very slow, and if I try and speed up I forget things like my wallet or phone, the address I am going to - I suppose the anxiety of going out causes confusion and disrupts clear thinking. Things like packing for a trip are very difficult and trying. I try and remind myself it is just a symptom and hopefully in time will ebb away. But I sure hate not being able to be normally active, out and about and enjoying life.:(