I can't comment on the pizza stuff, but on the COVID I'm going to provide a different perspective here.
I haven't had COVID as far as I know, and I test regularly due to caring for an elderly disabled person. In fact I haven't had as much as a sniffle in almost 5 years and I am in very good health, much more so than before the pandemic.
I also don't shield. I go to concerts, art galleries, plays etc, I travel. I work mostly from home but I do go to big work events occasionally. I meet with friends and family. My life is nice and I enjoy it to the full.
However I am not ignoring COVID. It is a serious illness with serious consequences for many people. It still kills significantly more people in the UK than car accidents, and we do use mitigations (seatbelts, insurance etc) for cars! There is no cure or treatment for Long COVID and nobody can predict who gets it. There are many people in the UK who have had to leave their jobs due to it, and at least 3% of the population suffers with it as per ONS figures. Cumulative infections increase risk.
So I take it seriously. I wear a FFP2/3 mask when I am in public indoor spaces. I am particularly strict about it in transport e.g. planes, buses. I don't eat in busy restaurants unless they have an outdoor patio. When I meet with loved ones and friends I ask them to cancel if they have any illness in their households, and I open windows. If they come to stay over they also have to test beforehand because my house, my rules. I go to a dentist who uses HEPA filters in their office and takes proper PPE seriously. I acknowledge there's also a degree of luck involved.
I don't find that this limits my life. I haven't hidden away. I've accepted that society has changed permanently to a degree, with the introduction of a new serious contagious illness in 2020, something that many people seem to be unable to process mentally. I don't blame them, there is also an incentive from capitalist interests to consume as normal and pretend everything is fine. However, acknowledging there's been a change doesn't have to be an apocalypse. There is a middle ground between "ignore ignore nothing is happening" and total shielding.
Many people pushed back against seatbelts when they were introduced, or against smoking bans. Now they are part of life. Someone asked what mitigations we could introduce against COVID- I think we can, and should normalise masking Japan style, and/or air filters and good ventilation in public spaces.
TL;DR: Your husband could wear a quality mask while your IVF is going on and still go to big events and enjoy life. They are very effective.