Mood swings. B traits? what is it?

I've used diff meds for depression in the past for 2 years. I was on escitlopram , clonazepam, diazepam, mirtazapine, amisulpide, queitipine, etizolam, flupenthizol and many other meds. However I stopped many  drugs as it were making me forget things. So now the symptoms have come back regressively and when I had gone to doc physically he said it's bipolar depression as there's lot of mood swings. He wrote lithosun. Now I couldn't tolerate that drug for some reason and when I said this to him he was not at all keen to change the drug. He prescribe the same thing again. I took online consultation doc wrote flouvoxamine and clonazepam and wrote diagnosis as cluster b traits? What is it? I'm expressing severe mood swings. I'm not able to keep calm, sudden anger, sudden frustration, guilt regrets even over small things, chest is paining, feeling short of breath, i never felt that earlier. This is extremely weird for me, I'm not able to eat not able to sleep. Extremely annoying. Please help