Leaving work in a middle of a stressful project

Hello everyone,

I am working my last two months at my very stressful job (I decided not to come back after the maternity leave), and my last day of work is end of May. Currently I have about 20 sick days which I haven't used yet. What i want to do is to use all of them or some of them during the last month. I realize that 20 days is way too much ( it will mean that I will be missing almost the entire month). So I want to use at least two weeks....

But I have bad conscience about that. There is a project which lies on me, but I won't see its results, since it ends in June, when I'm out. But currently I'm the only one working on it. Replacement will come in June, and it means that for 2 weeks, nobody will work on the project and it can just... fail?

My bosses are the main problem. They are the initiators of the project, but if I don't work on it, they won't do anything either. I know, it's a strange place.

So... I really want to take the last 2 weeks off, but there are 2 problems:

1. How do I justify it?

2. Leaving bad taste about dropping like that half way when the project isn't over. Won't it look like I'm a traitor?

Please give me some advice!!!