AIBU to ask if heartbreak gets easier after five days?

Everything gets better in time. In the immediate aftermath it's hellish and you can't imagine everything feeling better. But you do. One step at a time.

Yes it does. The shock of any major grief knocks you flat, but your brain and body can only stay in that state for a limited time. Eat your favourite food and make sure your son does the same. You are already making progress- you've asked for help here, you've bothered to weigh yourself. This time next week you'll feel so much better.

Because you’re dwelling on it! Keep yourself busy and allow short pockets of time to wallow. Do not allow it to consume you!

I’m going to give you some advice that my cousin gave me early days after the break up of a 13 year relationship and I’d been moping, “put your big girl pants on and have a can of (wo)man the fuck up!”
You are a strong independent woman and you will get through this! As Churchill once said the only way out is through!
He’s gone, he’s made it very clear by blocking you and your son that the relationship is over so you’ve just got to get on with it.
Keep busy, tidy the house, watch films, read books, see friends and family, eat comfort food, snuggle under cosy blankets.
He's just a man and probably quite a shit one. This isn’t the worst pain you will ever feel that would come from a child dying.

Of course it does. The gaps between thinking about it will widen from seconds to minutes to hours to days to weeks… to years.

Yes, it get easier. Take it one minute, one hour, one day at a time. Keep up with your usual routines. Eat easy to get down foods - soup, yoghurt, ice cream. It won't help if your body gets nothing at all so try to focus on eating a little.

I know it doesn't feel like it right now, but you are better off without him. Hold on to that. You are strong, capable and can achieve anything at all.

Visit your doctor if it gets too much but right now, just be kind to yourself. You are going to come out the other side - might take some time but you'll get there.