Please take care of your well being. As someone who goes through mental depression from time to time, I can honestly tell you that it sucks and you have to remember the celebrations of the happy times.
On that note, whenever I see an update for HH, it gives me joy no matter how big or small. The world you have created and the character development within in fantastic and deserves praise.
As far as pricing goes, I know that 5" figures usually go anywhere between $15-$30, but those are not hand painted. I would say take your cost, add 60% markup (average consumer markup), and then $15 an hour per figure. But that is just my opinion. [I've had many years of Sales experience to know this].
I hope you get well soon and look forward to another piece of the masterpiece you are building!
Never include shipping costs to the cost of the item. It's a separate charge dependent on where the item is being shipped. So unless you're offering free shipping (don't do that) then people will generally assume shipping is a separate cost to their purchased item.
I think the pricing math that archangelsephiroth gave is pretty good and gives you a nice price, though I'd see how much it costs with and without the added $15 an hour per figure (so just cost + 60% markup) and then decide which of the two you want to see it at.
Realize you aren't going to sell a lot, but those that want to buy them will be interested, so don't sell yourself short. As others have said, quality matters, so good quality is always worth the cost.
Also, maybe offer painted and unpainted versions with the unpainted versions being a bit less expensive (remove painter costs and maybe only a 50 or 55% markup).