(((((((((((BamaSurvivor))))))))))))
Don't worry, you're not insane. What you're going through is not abnormal.
I know dozens of other ppl who go through the same "periods" that you are experiencing. I went thru it myself many a time growing up. Got a real bad case of it after my 2nd brother to die d/t complications from a previous suicide attempt. 1 year ago......one day he just laid down for a nap & he just never woke up. Fluid in the lungs (he tried the rifle thru his chest; missed his heart by a millisecond, but perforated & collapsed one lung)
After my 1st brother's very successful rifle to chest suicide.....I was 14, he was 18...the Vietnam scene was real bad...I was obsessed about death......
How I got out of it was to journal...

Putting my feelings whenever they come up...it's what I call "puking on paper...keep a notebook handy and whenever you start to obsess about death...grab that notebook & just write what's going on, what you're thinking/feeling....be literally RAW
And if you have a T work thru what you've written; it could help?
Just a thought *hugs!*
Peace, DAYZEE9