[throwaway_java]

hopefully you can be honest about it -- if you are discriminated against because of this then that company is not a good fit for you anyway.

I personally would be honest about why you took the break including calling it what it is but framing it as managing stress and looking after yourself, and move on to how that terrible and isolating experience for you might actually increase your value as a co-worker. Eg, perhaps you now have better skills for managing stress, know exactly how much overtime you can handle, have a better idea of what sustainable pace you can work at, be willing to stand up against ridiculous deadlines that you know can't be met even if just for self preservation, will be more caring and compassionate and tolerant to co workers and perhaps recognise symptoms of burnout/depression in them before they do.

Best of luck, look after yourself!