I would go with your intuition--since it "bugs" you, that you don't feel anything, that may mean you haven't finished grieving, that you are "stuck" over some issue. These things have been known to come back and bite people in the emotional buttocks if not dealt with. Local hospice services have bereavement counselors that might help, and there is also the ubiquitous EAP. I never liked counseling (going through it felt like having an emotional debridement) but I learned that the alternative was worse.