I have had depression in the past and took Wellbutrin, too, which is supposed to work on dopamine receptors instead of serotonin ones, as far as I remember. I think eating grass-fed beef has really helped me in this area. I know you don't like it as well in warmer months, but it might be worth it to eat more beef and lamb anyway to get natural saturated fats with good omega 3 content. You can put it over a salad to make it seem more appropriate for warmer months.
If you do just go ahead and buy a jar of coconut oil and you don't like it, it is nice on your skin. You can always use it for that. I bought it for my skin initially and a year later learned you can actually cook with it. It tasted a little odd to me at first but after a while I really liked it a lot.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Heaviest squat: 180 x 2. Heaviest Deadlift: 230 x 2