I'm sorry you feel so scared OP. Remember we are all facing an uncertain time so you're not alone in feeling that way.
With regards to your question I have no idea, i guess it's one only a doctor can answer.
However, coronavirus might give the health scare a lot of people need in this country. Everyone has become so reliant on the NHS to treat/fix their self inflicted ills that they are in shock when faced with their own mortality. I say this with the best of intentions, if it gives people the wake up call they need to live a healthier lifestyle then that is one good outcome (trying to find the positives!).
I'm a type 1 diabetic, got diagnosed as a young adult, until then I was one of those people that never caught colds etc. I've always been skinny, dont smoke or drink, eat pretty healthily and so it was a surprise to me. Out of all the diabetics only 10% are type 1, 90% are type 2 (usually but not always brought on by an unhealthy lifestyle). I have to admit it does annoy me type 2 swallows up most of the funding and medical care in the diabetes arena, leaving little left over for type 1s for whom it is more serious and not self inflicted. I know if I could cure myself through diet and exercise I would in a heartbeat.
I guess what I'm saying is there will be a lot of people out there who have a health problem they can do nothing about that are also facing covid 19. Not just type 1 diabetics but also asthmatics, people with cystic fibrosis etc. I dont want to sound too harsh as nobody could have foreseen this but they will have to queue with people whose poor health is within their control to change.
I'm not trying to criticise people for their weight problems but basically I'm saying, if you can do something about it then do! You will be happier and healthier and us, well we will still be unhealthy sadly but we wont have to worry so much about resources being spread too thin.
Good luck with your diet, I hope it is successful and that we can all put this behind us soon 