What's wrong with me?

[Blah23]

Over the last couple of months I feel like something's happened to me. My emotions appear to have vanished. I was at a close family member's funeral today and felt barely any emotion. My libido is non-existent. I don't even want to masturbate. I just feel a bit 'dead' inside. I'm struggling to sleep
at night too.

I'm 40, I've been diagnosed with mild periodontitis gum disease, I also have pre-cancerous cells in my cervix needing treatment. So I know I have things going on but I just don't get why I feel like this.

It sounds like peri menopause, but could also be depression. Look at both to see which fits, but you have got a lot going on.

I agree with @DustyLee123. What you describe could be either depression on peri. Among others things of course, but they seem to be the two most likely suspects.
You're also going through a lot too and it may be just a temporary shutdown so you can cope getting through each new development that you're getting hit with and things might improve without intervention in time.
If you haven't already, I'd talk to your GP. But be careful, at your age (or any age) a lot if GPs will automatically try antidepressants without even considering peri. Not saying this ultimately will not be the right diagnosis and treatment for you but it would be good if you could insist on them looking into other things too. My practice have a couple of GPs who specialise in women's health and menopause so it might be worth checking out if yours do too.