What ever the cause of his change in behaviour, you cannot go on living like this, as the tension, uncertainty & grinding low level abuse will wear you down to affect your own health & wellbeing, & also for the rest of the family.
You are the closest to him & spend most time with him, you are the first to notice the change & take the brunt/first wave/rage. So far, his behaviour has not affected others so directly.
I like the approach suggested by @SocialConnection.Gather your evidence in a non-confrontational way, start to record discretely as you sense him cranking up. That you may notice or discern he follows a predictable pattern is of interest.
If you think that his behaviour changes have a medical basis, then suggest he visit the GP. But before you do that, I suggest that as his wife, & I assume that you use the same GP practice, that you speak with the GP to share your concerns - no more than that & you will not breach patient confidentiality - & that you are asking your OH to make an appointment. If his behaviours are affecting your own health, then see your GP for your own sake & explain the situation, again no breach of patient confidence.
Odds are your OH will resist going to the GP either because they don’t want to or have little insight, but you will have prepared the ground even if it lies fallow.
If the issue is not medical or psychological, then it’s a matter of his choosing to behave badly towards you & that is not acceptable. You offer him a choice: shape up or ship out.
PPs have made good suggestions around non-medical issues. New people, new websites he is into, is he tapping into new sources of indignation ? Uncertainty at work, recent losses ? Missed or broken plans/dreams/life passing him by.
Only drinking at weekend? Maybe not, possible increase during Covid of restricted movements so a possible everyday habit is harder to sustain or hide.
Loads of things are possible to determine his behaviour change.
Looking after yourself is foremost.