Going through a divorce can be very hard and it brings up a lot of emotions and it sounds like that is what is going on for you. Any ending can be tough even if it is one we advocated for or even more difficult if we weren't the one who wanted it. I believe it is important that you allow yourself to feel what you feel and acknowledge whatever those feelings are. It also sounds like you would benefit from speaking with someone face to face to get through these rough moments. The extra support can go a long way. if the therapist feels that your depression could be helped by medication they might suggest and evaluation with a Psychiatrist.
I am here to listen when you are back online, but in the meantime just know that your feelings are normal and getting some extra support can be helpful.
I am glad you began by reaching out to me here.