@Nocoletta - my boys are 21, 23 and 25 now, and I promise you that there are wonderful things about every one of the stages they go through - you have lots to look forward to.
You will still get plenty of cuddles - the other weekend, ds3 came home the morning after a party feeling a little under the weather (I have no idea why 
), and curled up next to me on the couch and snoozed whilst I cuddled him.
I can’t describe the feeling of pride I get when I see two of my boys with their degrees, out in the world, working at good jobs (a quantity surveyor with a law degree, and a secondary school maths teacher) and living independently, or seeing ds3 spend his whole summer working to make a bit extra money.
It is lovely - if galling - to have people who can reach things down from high shelves for me - even if they do tend to pat me patronisingly on the head and ask me if I need help because I am so short (that is the galling bit).
I notice from one of your posts that your baby blues are bad - I had post natal depression after all three of mine were born, so my heart goes out to you - I know how hard it can be. I remember foi g to a talk by Dr Katerina Dalton, who was a leading expert in PND, and her theory was that low blood sugar can contribute to it - basically her advice was to eat something with carbs in no more than an hour after getting up, three hourly during the day, and no more than an hour before bed - that will keep your blood sugar stable and will allow your body to use the progesterone your body makes - she said that it was the lack of this that caused PND, and if your blood sugar drops, your body can’t efficiently use what progesterone it has.
I only mention this because it is a simple, non medical thing you can do - and if it does not good, it will do more harm. You don’t need to eat a lot - maybe one rich tea biscuit or equivalent each time.
If it carries on, please do see your HV or doctor - it is treatable, and it does pass.
If there is anything I can do to help, please feel free to pm me.