Thanks for everyone sharing your experiences.
I haven't replied earlier because I was hospitalized due to my depressive episode about 6 weeks ago.

Now I'm convinced that the SSRI medication I was taking didn't work for me like it was supposed to. First my doctor stopped my mood stabilizer and added quetiapine along with lexapro. Well that made me swing between severe depression and hypomania so my doctor stopped the SSRI too. Quetiapine has worked miracles for me. After stopping lexapro all my hypomanic symptoms disappeared. Usually I have enjoyed my euphoric highs but now it was very uncomfortable: uncontrollable laughing, anxiety and pacing around not being able to stop.

I still have symptoms of depression and I'm still getting inpatient treatment, but I'm also slowly getting better. I hope quetiapine continues working as well as it has by now, and I can finally start a stable life.