I'm sorry to hear you're struggling. Depression is common after loss or stress. There are a number of different types of depression. Going for a good analysis is helpful. Only a licensed Psychologist or Psychiatrist can test accurately- but they can only base it on what you tell them.
Start by going to your family doctor and tell her what you told us. You don't have to have a psych referral to get meds- any doctor can start you on those. It does tend to be a trial and error process for finding the right meds, dose, etc. Meds combined with therapy is the best route. Try to find a good therapist to work with you on functional changes and cognitive issues.
If meds aren't your thing you can definitely improve the symptoms of depression with holistic lifestyle changes. Some studies suggest that 30-40 minutes of moderate exercise can be as helpful as meds for alleviating some symptoms of depression, but that's dependent on type.
Just start by going to your doctor and focus on taking good care of yourself physically and emotionally. It will get better!
