I deeply empathize with your experience with depression and respect your perspective herer Chandrayan.
But I'd encourage you to keep your mind to alternate perspective regarding this chemical imbalance point - there are spiritual pathways that can actually "heal" depression.
Deep meditation in the long-term is proven to rewire the mind, rebalance our chemical regulators, and actually change our "nature" through "nurture"
I can't say for certain if that's possible or guarantee the same for you - all I can give you is encouragement to entertain the possibility and give it a try.
I struggled with bipolar tendencies, insomnia, and severe anxiety/panic for a long part of my life too - but since I started meditating regularly, all of this has come into control - zero meds, zero diagnoses, zero chemicals.
Since Vipassana (an intense technique of meditation), this healing has only accelerated