Twitter is full of trolls with problems. They followed you to get you to click on their profile. The offensive pictures they put up were probably meant to offend or disturb, maybe this troll gets a kick out of offending people. You are not responsible for what other people put up on their profiles. Internet can bring the worst out of people, you did the right thing by reporting and blocking him. Maybe you can get back on twitter when you're feeling better.

maybe call center jobs aren't just meant for you. if this 4th call center job doesn't work out for you, maybe you could look for a different kind of job that you're sure you can do for at least a year, even if it's a 'filler' job, that should bring some stability back into your life.

It seems like the meds were working for you, talking to a therapist and getting back on them could benefit you too.