I'm worried about the possibility of getting the disease.
I am also worried about the effects of sitting at home with too much food and too little exercise.
If it were just me and other household members in (probably) reasonably low-risk groups* then I would probably take it less seriously than I do: Dez lives with us and as a kidney transplant patient is in a massively high-risk group. He will die in reasonably short order if he stops taking immunosuppressants as his body will reject his kidney. There is a strong chance that he will become very ill if he contracts the disease, as a result of him taking those immunosuppressants.
I am also worried about climate change. I know I keep banging on about this, but I feel that it is a far greater threat than CV-19. More people are already dying worldwide as a result of climate change than are likely to die from this current pandemic. More people have been dying from vehicle pollution than are likely to die from this pandemic. There is a fair chance that the reduction in vehicle use (which accounted for 40000 deaths in the UK in 2010, according to WHO figures) as a result of CV-19 will outweigh the number of deaths from the pandemic in the UK in 2020.
So there are loads of things to worry about. I just wish the government would take the other threats as seriously as they do this one.
*I too have been prescribed immunosuppressants (methotrexate) for my rheumatoid arthritis. Another forummer, also on methotrexate, remarked a long way upthread that they had received a government letter telling them that they are in a high-risk group and take relevant action, ie stay at home for 12 weeks and have as little contact as possible with other members of the household. I have received no such letter but I have had so little trouble from my arthritis for a long time that I decided almost 5 weeks ago to stop taking my tablets.