Not been through the menopause OP so can only offer my sympathies.
I am autistic though and the littlest things can set me off crying and snapping.
The first thing I could recommend is that as you're able to identify your emotions, and you know when you're getting sad you need to practice saying things to yourself like: do I need connection right now or do I need space? Can I get space right now and if not when is my next available slot that I can prioritise myself and my own needs?
Once you've answered those questions for yourself, then you can ask others for what you need. "Can I have a hug, can I have some space, I just need to pop upstairs for 5 minutes, I'm just having some feelings right now but it isn't a reflection on you, thank you for being there for me, thank you for giving me that time to dust myself off"
It's also important to note that you don't always perceive yourself how others perceive you. To you, you can logically explain you're not snapping, you're feeling overwhelmed by emotion, but to them they don't know why you're feeling the way you are and they can't just make assumptions that it's hormonal, so it is easy for them to internalise your emotions.
It can also feel like you're really isolated. You've already said your husband nearly died a few years ago and you were by his side 24/7. He's not reciprocating that, but that's because you're not nearly dying. To you, the feeling of being all alone in this is still really valid but to everyone else, the feeling of it being a lack of crisis is also still really valid. You're allowed to be upset, but they're also allowed to see this as another part of life and not a part of death.
I do feel that menopause needs to be discussed and publicised more than it is, because as another PP said women DO lose their jobs because of the menopause, they end up slowing down, they get assessed for capability, they're put through the ringer and are basically managed out of companies, and it's hard to prove because each woman's menopause is so different, but there should be more public tolerance for this natural change in our lives.
Please talk to your doctor again if it is making you feel really low. It's what they are there for. Mental health changes are a huge risk around menopause, and you do not have to suffer silently or suck it up but for now just try and find a way to communicate your needs so you can feel the feelings you are, so that others don't internalise them.