Good stuff here. I was married, then single, now married again. There's a lot of adjustments to be made whether single or not.
When single, I used to buy myself exactly what I wanted for birthdays, holidays, etc, because no one else would; I learned how to fix minor things wrong in the house (a huge difficulty for me); I mowed my own lawn until the mower broke; and, silly me, I used to give a hunky man name to my car!
Advantages of being single: you have absolute control over your space, finances, and what you do and when you do it, without any strings. I agree it's hard when there's no one to talk to at home, but there are many alternatives, especially on psych-central and sometimes people on here listen better than hubby anyway!