I WFH anyway, so the work situation is much the same, albeit I'm not getting as much work in, as much of it is wedding based.
The biggest change for me has been the DCs being off school/work - dealing with their boredom and frustration has been the hardest part emotionally - DS suffers with anxiety and ended up on ADs last year when his work situation was unstable. I was dreading the same happening again, but he's coped remarkably well - helped by the fact that his company found a way to furlough him even though he's on a zero hour contract, so is getting a lot less than he would've earned (Easter would normally be peak season for overtime, but he was paid as if it were the previous few weeks when the season was only just starting).
The younger DCs have been very self-motivated with school work so I haven't had to do much for them to be fair, but the cries of "what can I have to eat?!" every ten minutes are wearing thing. I gave up with packed lunches many years ago, relying on school dinners to save me the hassle of having to think about lunches. Having them all here for 3 meals a day is a total ball ache.
And just having people around all the time is weird for me, I'm used to total silence for much of the day!
I don't live with my DP so that was hard for the first few weeks, but when it became apparent that we might not see each other until September, we decided to meet up once a week anyway. The DCs are not able to see their dad at the moment as he's stuck abroad, so I figured seeing their 'step-dad' was no more risky in terms of spreading germs than if they'd been able to see their dad.
Apart from my random Amazon binges and LOTS of food, my outgoings have been pretty modest. Ironically, this crisis could be the thing that helps me get back on my feet financially!
Mental health-wise, I was never one for meeting up with lots of people, but I also hate Zoom etc so am feeling quite isolated. I don't speak to anyone but my DCs most days. Text DP a bit and occasionally Facetime, but I don't really like it. The idea of going to Costa with a friend, or popping round someone's house for a cup of tea is now very exciting 
I'm very aware that I'm lucky to have a garden, I'm in a city but surrounded by lovely lakes and walks. I really feel for those who don't have that, and don't blame some of them one bit for flocking to the coast or other sites of natural beauty for a day of relaxation to get away from normal life.
I was terrified at one point that we'd end up with a Spanish/Italian style lockdown where we had to stay inside with no exemption for exercise etc needing a document to allow us out once a day. I can only imagine how awful that would be for someone without a garden or any access to outside space. I really wish people were more tolerant of other people's situations at the moment.