Its ok to feel low and feel lonely - just not to wallow there.
You arent on your own, remember that, and dont try and do this on your own thats what leaves the door open for the drinking to excess, gambling or whatever other vice finds its way in.
Your friends might not understand what your going through (unfortunately around 40% will someday) but that doesnt mean they arent there for you and that doesnt mean if you ask them to help you that they wont - you just need to be willing to ask, because i'm willing to bet the real friends (and some strangers even) want to help you through this.
One of the things you'll read a lot (here and in books) is that expectations and unmet needs are a lot of what sits behind all our various difficulties. But this is good in that there is a fix - dont have expectations and if you have an unmet need find a way to meet it yourself or ask for what you need
makes its sound so easy
As for tips, Exercise, eat well and GAL, GAL, GAL - it might feel a bit empty, like your just filling time but its better than wallowing.
Have a good day.
Both mid 30s, 2 young kids BD 7sep14 XW moved on long ago, now living with OM1 D paperwork in progress