Sounds like you're overwrought. Agitation drains you emotionally & could explain why you feel divided. On the one hand you feel fight & flight & on the other exhaustion. You mention little things are bothering you, are you able to sit down with a cuppa and nut out a resolution or maybe come to terms with you can't do anything about them and accept they are what they are. Can you take some "me" time do something relaxing or pamper yourself? You have my sympathy mental divisiveness is the pits.