Honestly I think looking at social media way less would be much more helpful for your mental health than talking to your psychiatrist. In my experience, therapy is good but it is only one half hour out of your 168 hour week. What really matters is what insights you can learn about yourself in that half hour that you can apply to the other 167.5 hours: better long-term habits.

Not to get all Jordan Peterson here, but personally, I find that going for walks, reading books, and eating healthier food helps to improve my mood. Yes, it is true that climate apocalypse is coming and the forces of capitalism, racism, and imperialism are trying to divide the world into the upper 1% being glorious god masters and the 99% being their permanent slave class. But revolutionary optimism requires looking at history, and recognizing that the greatest positive changes to society came as a response to the most horrible tragedies that humanity has seen, that Marxist teleology does not predict a steady improvement of conditions, but the constant sharpening of contradictions as capitalism causes its own inevitable, chaotic collapse.