First, you could have easily reacted terribly and you didn't. How many parents would have absolutely erupted at the dropping of an iPad by their kid? Many many many would have reacted in the heat of the moment with furious anger. You acknowledge that it's just stuff and it was an accident. That's a great thing. Not everyone can do that.
Second, I work as a case worker for adults with mental illness (having bipolar and panic disorder the irony is not lost on me) and the job market is horrendous. Unfortunately it is so much harder to find a job in any field. You'll get something. I work through the state and the average time to find new employment can last up to 12 months bc it's soooooooo f'n bad. Cheer up you'll do a company great.
Do you have Xanax or klonipin maybe to relax the extreme sense of anxiety and being overwhelmed.