It's kind of blurry. For one I'd never had a solid diagnosis of depression. I've got a diagnosis of general anxiety disorder but this is more or less a catch-all and after seeing a therapist he only wrote was more or less 'adaptive disorder'. So I don't want to say that reading some philosophy will cure your depression or your problems.

That being said: Realising your spheres of control and the limits of control helped a lot with anxiety. Stoicism is kind of like math. It's a concept to life a life. It's worth nothing if you only read the texts. You have to practice and ingrain the concepts. Well you even have to really understand the concepts. I did neither. It's still comforting and calming to read the ancient texts.

It helps with anxiety as it helps to put things in perspective. As it challenges you to conquer your fear.

As for depression... I can only speak for myself but but reading the ancient texts helps you to realize your role in the world and to bring back your unrealistic thoughts into productive ones. Albert Ellis used stoic philosophy as a building block of CBT. Reading the originals is always worth it.

As for the perspective on emotions: Yes. Stoicism has some very radical views on emotions. I'm not a stoic and I don't want to be one but basically the overall idea is to act despite emotions. Don't ignore them, don't suppress them but accept them and act despite them.

It's difficult and it's not a cheesy solution to all your problem. But it's worth a read. It's the foundation of Christianity so it's not that far away from western society. Don't take it as religion. Read it critical in the historic context and read other books but I've found it worthwhile.