Oh. 
I cried reading your post.
I'd already been having a shit time before this started and I feel really scared and hopeless about how alone I am, especially as this has taken away the possibility of being able to reduce how isolated I am and the only remaining piece of hope I had for making life less crap.
This morning I cried down the phone to a random stranger at Samaritans about how much I wish my mum was still alive so I could have a hug. Or just have her there still to call as someone who knows me and loves me and cares about me. I didn't get to have any of that as an adult.
Instead all I can do is phone a random stranger who doesn't know me, will never meet me or speak to me again, needs me to explain everything from scratch, doesn't really care about me or what happens to me, will forget me, and who will definitely never come to my home to comfort me or offer me a hug.
I don't want to make you feel bad. Your post was reassuring in a way to see I'm not weird for missing my mum. I've been feeling embarrassed and stupid for still crying over how much I miss her. But she died so young and she should still be here.
If you can, try and focus on the fact this situation is uncertain and scary but temporary. You will get another chance to be hugged and to hug them back. This is all in place to keep you all safe. Could you get into a routine of regular video or phone calls? Are they set up with the tech for that? Could you cook together over Skype and things like that? Maybe put out more photos? Or save an album of your favourites on your phone to look at?
When I'm struggling with aloneness I have a blanket I sort of swaddle myself in. It's not the same as being hugged, but it feels a little containing and comforting. Sometimes I just scrunch it up and hold it in my lap instead, because the weight and softness are comforting. It might be something to try when you're feeling sad or overwhelmed? Or you might find something that works better for you. Maybe you could gather a few things that comfort you when you feel sad or lonely? If you do, it can be good to cover different senses.
Coming up with some kind of new routine can soften how overwhelming it all feels. And a distraction project running in the background - focuses your mind and lets you feel like you're achieving something.