Speaking as one who has suffered from depression for better than 30 years since I was a small child, I do not consider it a blessing in the least, I find it akin to having Satan’s jackboot on my neck. A curse and horror of unimaginable proportions.
I would never deny the intense suffering that is a part of bipolar disorder and depression. It caused me to seek admittance to a psychiatric hospital. but I, too, have dealt with this for more than thirty years and it has not been all suffering. And my greater point in all of this is that suffering, in itself, can be blessing.
I would encourage you to stay in treatment, to seek God desperately in the midst of depression, to praise Him simply because of who He is even if you are angry with Him (I’m not assuming that you are angry with God, but if you are, then I say let Him know it - even angrily - and listen for His reply and keep seeking Him)and believe expectantly that He will bless you and that His grace will be sufficient for you. That is what He promises when we surrender out lives to Christ and that is what He has done for me. I pray the best for you.