The symptoms that you are sharing could also be caused due to an underlying physical illnes like blood pressure, or
vitamin deficiencies. I would suggest you get yourself checked one before making a conclusion about it being a psychological problem of anger and dissatisfaction with your relationship. Because all of this also depends on the duration of this feeling of anger. I mean was it always like this for you?
Next Steps
If it is a psychological/relationship problem the only solution you have is to give couples therapy a try. because it is important to understand the underlying causes for feelings of anger, insecurity, and loneliness that you are feeling in this relationship.
Health Tips
There is a need for a proper diagnosis of the problem, it is always important to cross check for underlying physical problems before concluding it to be a psychological problem.