TT, one of the things that I used this "gift of time" for was to really figure out how to get my own tendency towards depression under control. I chose to do CBT on my own, after not finding a practitioner that I felt I could work with (and pay....); I looked at all sorts of books, settled on David Burns "Feeling Good", and sat down to the hard work. (OK, curled up in the foetal position...) There is no substitute for doing the exercises in writing, unfortunately. I also used "Overcoming Worry" to deal with anxiety.
I probably spent 2 years on those.... that sounds like a lot, and it is, but time passes and that was now also several years ago. It doesn't "cure" it instantly, but I recently went back and looked at some of the scoring and evaluation tests and realised that even with everything still going on I was back in a "normal" category, when I had been in "moderate depression" (which is actually very bad -- I don't want to think about what "severe"is) when I started the work.
I also got a therapy lamp, which I keep on pretty much all the time I'm at my desk. SAD or not, it really does help. Not cheap, but worth it. Again, on it's own it's OK, but in conjunction with other things it makes a difference.
Even if it is tied to hormones (in which case some medication might help as well...) this approach can help manage feelings whatever their cause. I say can help; it's not a magic bullet, but it was the most appropriate for me.
Sorry, this is getting off the subject of MLC from an expert.....