I started using Betaferon in May-June 2011 and it turned me in a real nuts. Irritable all the time, mood-swinging all day long and shouting at people while realizing I had no reason for that. I know that this doesn't happen to everybody doing Betaferon, but it was horrible being in my head at that time. I suppose that's why Betaferon might induce suicidal ideas. So I stopped taking it some time at the beginning of September and I still find it hard reaching peace of mind. Or meditating for longer than 20 minutes.
I'm sorry you had such an awful experience with it. I know how terrible it is not to be able to control your own mood and emotions. How are you doing with your decision to stop the drug? Are you going to try something different?
I never really wanted to take one of the DMD's as it meant not living abroad because I would have to move back to my home state to have one covered by my insurance. When I was first diagnosed I tried one dose of Betaseron anyway, still unsure of whether MS meant I could no longer live and travel in other countries, and broke out in an all-over-body rash 24 hours later! It's really just as well for me.... I have had depression before and every drug from caffeine to cold meds etc affects my mood so much, I don't doubt I'd have been one to feel depressed or moody on it.
I hope your concentration and everything improves. Has your doctor said whether or not effects from the drug can last a long time?